Animals Archives

May 16, 2020May 15, 2020

Frog Reproduction Variations

We tend to think of frogs and toads as fairly common creatures, varying only in color and size. Dr. William Duellman has done extensive studies of the amphibian order Anura which includes more than 3800 separate species of frogs. His studies show enormous frog reproduction variations.

Some frogs lay eggs in clutches near, but not in, the water. They glue the eggs to vegetation or rocks where the tadpoles drop into the water when the eggs hatch. Other frogs lay eggs in a protective foam that protects the eggs and provides food and water that can last for up to ten days. One-fifth of all frog species hatch into froglets instead of tadpoles. Each four-legged froglet has an attached yolk to supply nutrition until it can catch its own food. The males of one frog species glue themselves to the back of the larger females. The female digs a burrow in the ground to lay the eggs. She then wets the eggs with water from her bladder, and the male fertilizes the eggs.

The males of the African hairy frog develop rigid hairlike extensions of their skin during breeding, so when the male sits on the eggs, he protects them from predation. In the poison dart frog of Costa Rica, both sexes guard the eggs. When they hatch, the female brings unfertilized eggs to the tadpoles to eat until they can find food on their own. The females of the Jamaican tree frog lays water-filled capsules along with the eggs to provide adequate water for the tadpoles. In some species, the tadpoles crawl onto the back of either parent. Some frogs have pouches on their backs that hold eggs that have gill-like structures that enable the embryos to breathe.

Other unconventional frog reproduction variations include Darwin’s frog in Chile. The male scoops up the newly hatched tadpoles into his mouth and broods them there for several weeks until they mature. Even more bizarre is an Australian frog in which the female swallows the eggs after fertilization and incubates them in her stomach. This process, called gastric-brooding, usually takes six weeks in which the female does not eat. The tadpoles secrete a substance called prostaglandin E-2, which neutralizes the hydrochloric acid and pepsin normally used for digestion.

All of these reproductive strategies are designed to cope with different environments. Frogs can exist in a desert or a tropical rain forest or even a polar area. Survival is only possible because their reproductive systems are designed to fit the environment in which they live. The intricacy of frog reproduction variations is an excellent example of the intelligence and design God has built into the simplest of living things.

To read more, you can find it in Scientific American, July 1992, pages 80-87. Available digitally HERE.

May 12, 2020May 11, 2020

How Do Sea Animals Drink Water?

Yesterday we discussed how fish drink water. In the ocean, the problem isn’t water but salt. Ocean fish are designed with specialized gills that support the kidneys in getting rid of salt accumulations that would otherwise pickle the fish. Obviously, not all animals that live in the ocean have gills. How do sea animals drink water?

Albatrosses and petrels are birds that can spend a year or more in the open ocean, but they need to drink water. Whales and seals also do not have land-based water supplies, and yet, like all mammals, they need water to survive. So how do sea animals drink water when ocean water is salty? God’s design of living creatures always includes unusual equipment to enable them to deal with their environment.

In the case of sea birds, they have a set of salt glands in their heads that connect to the bird’s nostrils. The birds drink seawater, but the glands are so efficient that within three hours, all of the salt is removed through the nostrils.

Whales and other aquatic mammals produce urine that has extremely concentrated salt content. By allowing high salt concentrations in the urine to diffuse into the ocean, the salt never reaches toxic levels inside the animal. An interesting sidelight to this is that the milk of these sea mammals is very low in water content. In that way, they conserve water. Milk from seals has only half the water content of lean hamburger.

Everywhere we look in the natural world, we see that a wonder-working hand has gone before. These marvelous designs are not the product of mindless chance. They show an Intelligence who created with purpose and wisdom. When we realize that ocean water has high salt content, we question, “how do sea animals drink water?” God already took care of that.

In Job 38-40, God challenged Job to advance his understanding of God’s power and wisdom by considering the natural things of creation. When Job questioned God’s wisdom and purpose in his personal struggles, he did not recognize the wisdom shown in creation’s design. We too need to look at what God has done and “know there is a God through the things He has made” (Romans 1:18-20).

Data from National Wildlife magazine, June/July 1995, pages 30-34.

May 11, 2020May 17, 2020

How a Fish Drinks Water

Have you ever wondered how a fish drinks water? Your first reaction is probably something like, “It opens its mouth.” Like most things in life, it isn’t that simple.

All living things necessarily have some saltwater content in their bodies to keep chemical balance allowing life to exist. The fluids inside an ocean-dwelling fish are only about a third as salty as the ocean itself. The water inside the fish’s body tends to leave by osmotic pressure, which is the tendency of fluids to move through membranes toward higher concentrations. To avoid this loss of water, the fish does simply open its mouth and drink seawater. But that brings large amounts of salt into the fish’s body. The salt concentration would be more than the fish’s kidneys could handle. To aid the kidneys, the gills of ocean fish are designed to expel salt, so the fish isn’t pickled by it.

In freshwater fish, the osmotic pressure is reversed, so the fluids inside the fish are saltier than the water outside. The skin of a freshwater fish is designed so that water seeps in through its skin and gills. Therefore, the fish doesn’t have to drink at all. When a salmon leaves the ocean and enters a freshwater stream, it merely stops drinking. Like freshwater fish, it depends on its skin to bring in its water needs.

Now that you know how a fish drinks water, the next question would be about other creatures that spend their time in the sea. Birds like albatrosses and petrels can spend more than a year at sea, and whales and seals live in the ocean 24/7/365. How can they avoid being poisoned by the salt? We’ll discuss that tomorrow.

God’s design of life includes fitting living things with specialized equipment to survive in every environment. Fish are remarkable creatures specially equipped for the waterworld in which they live.

Data from National Wildlife magazine June/July 1995, pages 30-34.

May 8, 2020May 7, 2020

Ants Use Vibratome to Cut Leaves

Yesterday we wrote about leaf-cutting ants that engage in farming activity, which we used to think only humans did. The 1994 Disney movie Lion King started many people thinking about what these ants do. There is another tool leafcutter ants have that is impressive. These ants use vibratome to cut leaves.

Vibratome is sound emissions that alter the structure of matter close to the sound. Biologists use sound waves to prepare specimens to be sliced for microscopic examination. The sound waves cause soft material to become more rigid and, therefore, easier to cut. Ants had used vibratomes long before scientists discovered it.

As we said yesterday, leafcutter ants in the Atta genus slice off sections of leaves and carry them to their nests to feed the fungi they harvest. Researchers have found that as the ants cut, they chirp at a frequency of 1000 hertz. That sound frequency rigidizes soft leaf tissue, making it easier to cut. Vibratome is a technically sophisticated technique and one you would expect skilled technicians to use. Materials science is a relatively new field, and yet ants have it built into their DNA to chirp at a specific frequency as they cut leaves to feed the fungi they eat.

How is it that ants use vibratome to cut leaves? How did they know that it would stiffen the leaves and allow them to make a smoother cut? Scientists further discovered that the vibratome effect does not speed up the leaf-cutting. However, it enables a smoother cutting of the tender leaves, which the scientific report said gives “the most desirable harvest for the ants.”

God created the leaves as well as the ants that use the leaves to feed the fungi they eat. He gave the ants wisdom to use vibratome to cut leaves. The writer of Proverbs reflects God’s wisdom and intelligence in 6:6-8, “Go to the ant … consider her ways, and be wise.”

You can read the full scientific report on researchgate.net

May 7, 2020May 10, 2020

Ant Farmers at Work

We commonly think of animals as opportunists. They find their food and eat it or store it for future eating. One of the characteristics of humans that distinguishes us from the rest of the animal kingdom is that we prepare an environment that produces our food. Farmers plant seeds and tend the crops by fertilizing, protecting from threats, and watering when necessary. They also make arrangements for future crops. Entomologists are finding more and more cases where insects do these same things. For example, ant farmers work together to produce their food.

In Fiji, a plant called Squamellaria grows in a cluster with jelly-bean shaped bubbles inside. The opening into the clusters is just the right size for the Philidris nagasau ant to get into the bubbles. As the bubbles send out shoots, the ants defecate inside the cluster, fertilizing the plant. When the plant blooms, the ants eat the nectar it produces. The ants then plant the seeds where new clusters can grow.

Another family of ant farmers is the Atta genus. In their farms, they grow a fungus species that they nourish with leaf cuttings. After cutting off leaf sections, worker ants carry them back to the colony. As the workers transport the leaf cuttings, others ride on the leaves to protect against a parasitic fly species. You might call that pesticide.

At the colony, other ants pulverize and defecate on the leaves to make them ready to nourish the fungi. The ants can’t eat the leaves, but the fungi are their food, and only one fungus species is edible. If another fungus species develops, the ants produce a toxin, which destroys only the invading fungus. This is herbicide use at its best. The Atta ants inspect the fungus several times a day, tending it carefully. The system is so efficient that one Atta nest can grow enough fungus food to feed seven-million resident ants. In the process, the ant colony produces fertile soil that promotes plant growth.

If you saw the 1994 Disney animated Lion King movie, you saw Atta ant farmers at work. Remember that fungi are not photosynthetic. No sunlight is needed for Atta ants to grow their food. They simply carry in the nutrients for the fungi to grow, and then they eat the fungi. We do the same thing with much of our meat, providing plant material for chickens or pigs to eat, and then eating the animals that we fed. In the case of the ants, they eat only one food, which simplifies farming enormously.

We know it takes incredible planning and design to manage a farm. No chance process produces most of the foods we eat. It requires meticulous planning and careful application of fertilizers, pesticides, and herbicides. As scientists study insect farming, they see a design that is carefully and intricately produced.

Data on the ant farmers came from Science News, April 25, 2020, pages 16-20. The subtitle of the article is, “Could our agricultural role models have six legs?” This reminds us of the challenge in Proverbs 6:6-8: “Go to the ant … consider her ways, and be wise. She has no guide, overseer or ruler but provides her food in the summer and gathers her food in harvest.” The title of the article is “The First Farmers.” We might amend that to be “God’s First Farmers.”

Click HERE to learn about a special tool leafcutter ants use.

April 27, 2020April 26, 2020

New Zealand Kiwis Are a Treasure

There are animals designed to fill every ecological niche, and they are often specialized for a local ecosystem. Many flightless birds have a unique ability to fill a specialized niche. Penguins and ostriches are examples of that. New Zealand kiwis are an especially odd example of birds designed for a unique environment.

These flightless, nocturnal birds fill a niche in the New Zealand forests. They are about the size of a chicken, and they eat worms, insects, and berries. Kiwi feathers resemble the rough fur of some mammals rather than bird feathers. The feathers shed dirt efficiently, which is good since they live in dug-out burrows underground. Kiwis get their name from their vocalizations, which sound like “keee weee.”

Kiwis have no keel on their sternum and no tail, so they can’t fly. They do have muscular legs with four toes. (Most flightless birds in the ratite group have two or three.) They have thick, tough skin and heavy, dense bones. (Most birds have hollow bones for flying.) They have a low body temperature for a bird. Their bills have nostrils at the tip, giving them an acute sense of smell. By eating worms, grubs, and insects, kiwis maintain the ecological balance needed in the forest. New Zealand kiwis had no predators until humans introduced dogs and cats to the country.

Kiwi eggs are designed differently from other bird eggs. They are huge, being equal to 20% of the mother’s weight. It would be like a human mother having a baby one-fifth of her weight. The eggs have twice as much yolk as other bird eggs, and they contain antibacterial and antifungal materials needed for living in underground burrows. The male sits on the egg until the chick kicks its way out since kiwi chicks have no egg tooth to break the shell. The parents do not feed the chick, which lives on the extra yoke until it can follow the male outside to get worms and insects.

God’s design is different in each ecosystem, but there are always creatures that provide balance. When humans upset that balance, the result can be a disaster. New Zealand kiwis are an example of unique specialization to support the forests of that unique country. To the people of New Zealand, they are a treasure.

Data from the NewZealand.com

April 26, 2020April 26, 2020

Biomimicry Solves a High-Speed Train Problem

Japan has been a world leader in the development and implementation of high-speed trains. More than 10 billion Japanese passengers are transported by rail each year, and those trains keep the population highly mobile. However, biomimicry solves a high-speed train problem.

One of the major difficulties with the high-speed rail system was that the trains had a bullet-shaped nose. That design compressed the air creating a severe shock wave every time the train went through a tunnel. This “sonic boom” was especially bad in cities, and because Japan is densely populated, the sonic shock waves were a real problem.

The chief engineer for the West Japan Railway Company named Eiji Nakatsu also happened to have birding as a hobby. He was trying to solve the sonic boom issue when he saw a kingfisher dive into the water from a high elevation without even making a splash. He was also aware that owl feathers have the unique ability to absorb sound so an owl can dive quietly on its prey.

Nakatsu and his fellow engineers took the examples that birds offered and built the front of their trains with the equivalent of a kingfisher bill. They also installed a quieter pantograph design based on owl’s wings. (The pantograph is the device mounted on top of an electric train to collect the power from an overhead cable.) in 1997, trains using those designs went into service, and the tunnel problem and noise issue were resolved.

It is called biomimicry when human designers copy something they see in nature to solve a technical problem. There are many examples of biomimicry from velcro to binding straps. God thought of it first, and humans have merely learned to copy God’s design. That’s how biomimicry solves a high-speed train problem.

Reference: Smithsonian magazine, September 2012, pages 52-53.

April 24, 2020April 23, 2020

Why Do Birds Fly North in Spring?

We all understand why birds of the Northern Hemisphere fly south in the fall. When the temperatures drop in Michigan, and the lakes are covered with ice, most birds have found a warmer place in the south. Michigan has many so-called “snowbirds” in the human population who leave us in November to go to Florida’s sunny shores. They come back in the spring to enjoy Michigan summers and because they have family here. The question is, why do birds fly north in spring? Couldn’t they save a lot of trouble by just staying in the south all year?

The answer to that question is food. The fact is that tropical areas simply don’t have enough insects to provide the protein that birds need to feed their chicks. When birds are in the south, they survive by eating berries, fruits, and nectar. None of those foods provide much protein. The time when birds return to the north coincides with the explosion of insects in the spring. They can enjoy less competition and longer days while dining on insects in the north.

The question remains as to how the birds know this? How do they know that they can benefit by traveling hundreds or thousands of miles in the spring? Why do the birds have the urge to fly north at the time that benefits them as well as the ecological systems they help to support? In other words, why do birds fly north in spring? The answer is that it’s built into their genes.

God’s view of Earth and the systems that make it work is far greater than ours. We are beginning to understand how many things, such as bird migration, must happen for the system of life to exist. It also speaks to us about how important it is that we take care of what God has given us.

Reference: Smithsonian magazine, May 2020, page 88.

April 18, 2020January 4, 2023

Mesozoic Era Small Animals

What most people know about the dinosaurs is what they have seen in a movie or a museum. The emphasis is always on the massive size of these ancient animals. Those of us with a background in paleontology are more interested in the ecosystem in which they lived. The Mesozoic era was a time when the Earth was very different from what it is today. It appears that the oxygen content of the atmosphere was higher, and the temperature was much warmer. The plants and animals living at that time enjoyed a balanced ecosystem that left a legacy that has allowed us to live comfortably on this planet.

The natural resources humans have depended on for our entire history were produced during the Mesozoic era. These include coal, oil, and a wide variety of soils that allow our modern plants to exist. From a biblical standpoint, this was a part of Genesis 1:1 when God prepared the Earth for what was to follow. For more on this, see “God’s Revelation in His Rocks and His Word” on our doesgodexist.org website. (You can purchase printed copies HERE.)

What many people don’t realize is that while the giant dinosaurs were an essential part of the Mesozoic era ecosystem, small creatures were of equal importance. Insects were a significant part of the system, and fossil remains of all kinds of arthropods are abundant in the fossil record. As we all know, insects can reproduce in destructive numbers. Just as there were meat-eating dinosaurs to keep the plant-eaters from destroying all the vegetation, there were insect-eaters to control the insect populations. We have insect swarms like the locusts that are causing massive problems in Africa today because humans are removing the natural controllers of insect populations.

The recent discovery of a creature named Oculudentavis khaungraae has shown us a dinosaur the size of a bee hummingbird, the smallest known modern bird. This dinosaur’s skull was half an inch from front to back, and it had a mouth full of teeth. It was ideally suited for eating insects of all kinds and sizes and was undoubtedly a vital part of the ecosystem during the Mesozoic era of the dinosaurs. God has always used one existence to prepare for another, and the preparation of the early Earth for humans was a long and highly complex process.

Our existence on Earth is also a preparation for a far better one. Continuing to study God’s creation and His Word helps us prepare for that time when we will exist outside of space-time. Read about it in Revelation 22:1–5.

Reference: Science News April 11, 2020, page 4.

April 16, 2020April 13, 2020

Chimpanzees and Humans

Books and articles have been published indicating that chimpanzees and humans share about 98.7% of the same genes. So some have suggested that chimpanzees should be considered 98.7% human and have all the rights that humans enjoy. There have been lawsuits to remove chimps from zoos or restrictive areas so they can express their “humanness.”

Objective observers who study chimp behavior in detail do not see chimps as human. The Bible makes it clear that only humans are created in the image of God. Being in God’s image leads to attributes that are unique to humans. Those include not only creative ability such as in art and music, but they also include the way we treat one another. In Galatians 3:28, Paul makes it clear that as Christians, there is no distinction between one human and another. Paul specifically includes “no male nor female” in his list of who are equals. The whole notion of marriage (Genesis 2:24) and the role of women (Proverbs 31:10-31) esteem and protects women.

Chimpanzees and humans are not alike. In his book The Human Swarm, Dr. Mark Moffett describes the real life of female chimpanzees. When female chimps reach sexual maturity, they leave their group never to return. Female chimps are beaten up or ignored by males except when they are in heat, and then sex is forced upon them. Female chimps do not befriend each other. They give birth in a private, hidden place to avoid having their babies killed by other females. Male chimps have no role in parenting or protecting the mother and baby.

There is an adage said in jest that we often hear in the break room at the graduate center, “Make sure your data conforms to your conclusions.” It is easy for us to interpret animal behavior as human-like, especially comparing chimpanzees and humans. But we must recognize human uniqueness. We have heard the horror story of a pet chimp turning on and seriously injuring a human. You can remove the chimp from its fellow animals, but you cannot remove the animal behavior from the chimp. We are the only beings created in God’s image.

Reference: Skeptic Magazine, “The Misunderstood Art of Making Comparisons” Volume 25:1 2020