One of the amazing features of animals is design in hearing. Humans can hear sounds between 20 and 20,000 vibrations per second (Hertz). That range allows us to communicate through the air and enjoy music. Various animals can hear sounds in different parts of the frequency spectrum.
Dogs can hear frequencies higher than 20,000 Hertz.We call these sounds ultrasonic because they are above the frequencies we can hear. We use ultrasonic sounds for examining the organs inside the human body. We use it to view unborn babies inside their mother’s womb. Ultrasonic sound has uses such as cleaning of jewelry or other items. But we can’t hear it. The ability to hear ultrasonic sounds gives dogs and other animals a defense advantage. Try to sneak up on a dog. If you open a door or step on a floorboard creating an ultrasonic squeak which you can’t hear, the dog will hear and know that you are coming.
Elephants, whales, and other large animals can hear low frequencies and use them to communicate over many miles because low frequencies travel more efficiently through the ground or water. But it isn’t just large animals that use these subsonic sounds. Some small animals, like moles, can also hear low frequencies since those sounds travel well through the ground. If a mole communicated through sounds we could hear, finding and killing them would be easier for their predators and us. Because they communicate at frequencies below 20 Hertz, they are not easily detected by animals above the ground.
Design in hearing also applies to frogs, snakes, and many insects that can also hear very low or very high frequencies allowing them to communicate with others of their kind without detection by different species. Different creatures use various portions of the audio spectrum. If a creature gives off sounds that its predators can hear, they will literally be “dead meat.”
It’s a case of Romeo seeking Juliet. He has been called “the loneliest frog in the world.” His name is Romeo, and he’s a Sehuencas water frog (Telmatobius yuracare). He may be the only one left.
Sehuencas water frogs lived in the subtropical and tropical areas of Bolivia. Romeo has lived in the Cochabamba Natural History Museum in Bolivia for the past ten years. No Sehuencas water frogs have been seen in the wild since 2008. Their life expectancy is up to 15 years, and that means Romeo’s time for finding a mate is limited. Unless he can find a mate, the species will probably become extinct.
Because of this emergency situation, Global Wildlife Conservation and the Bolivian Amphibian Initiative have taken matters into their own hands. They have teamed up with the dating site Match.com to find a mate for this lonely frog. Actually, it is doubtful that any female Sehuencas water frogs–if there are any–will see Romeo’s posting on Match. However, the groups are hoping to raise awareness and to raise $15,000 by Valentine’s Day to launch expeditions into the areas where these frogs formerly lived in the hope of finding a mate for Romeo.
The story of Romeo seeking Juliet has gone on for years. When Romeo was a young frog, he sent out mating calls with no response. Those calls have slowed down in recent years. In Romeo’s Match listing he says, “I’m a pretty simple guy. I tend to keep to myself and love spending nights at home.” His status is shown as, “Never married.” He concludes with the statement, “So, if you believe in love and want to help an old frog out, please donate to my cause.”
Almut Kelber is a sensory biologist at Lund University in Sweden. For many years Dr. Kelber has been studying the super night-vision in frogs that allows them to hunt and move about in extremely low light levels.
In the August/September issue of National Wildlife (page 10) the group that Dr. Kelber leads reports that amphibians have unique rods or photoreceptor cells in their retinas that are not found in any other vertebrates. These receptors allow frogs not only to see in the dark but to see colors in extreme darkness. Humans can’t distinguish colors in low light, but frogs can see colors in light levels where human eyes would not see anything at all. Dr. Kelber did not expect to find that “these animals can see color in extreme darkness, down to the absolute threshold of the visual system.”
Over and over we see specific equipment built into living things that allows them to survive in their environment, defend themselves against predators, and find unique access to food. You can believe that this is a simple trial and error situation, where having the equipment promotes survival and not having the equipment is lethal. Or you can believe that an intelligence designed and engineered these structures to allow our planet to be a unique oasis of life.
One of the children’s books that we have in our children’s series is on Frogs and Toads. Re-reading that little book written at a child’s level motivated me to look into some of the unusual things about these amphibians. Of the 7,537 species of amphibians, 6,631 are frogs and toads. One thing some creationists have not considered is that if you interpret “kinds” in the Bible to refer to species, you have many problems explaining how you get 6,631 species of frogs on Noah’s ark. The point is that the Old Testament Hebrew word “min” (translated “kinds” in most translations of the Bible) is not the same as the English word “species.” “Kind” has a much broader meaning. We find the same concept of “kinds” in the New Testament. In 1 Corinthians 15:39 the writer tells us that there are four kinds of flesh, the flesh of men, of beasts, of fishes, and of birds. We would suggest that changes due to environmental pressures have caused frogs to speciate to enable them to adapt to their individual environments. Frogs living in trees don’t need the same equipment functioning in the same way as frogs in a pond, in a sand dune, or in a cold place. This factual evolution is seen in most animals, but very clearly in the frogs. We still have much to learn about this. Toads and frogs have an organ called a “Bidder’s organ.” The purpose of this organ is unknown. It is present in all toads in early development but only in the males in adulthood.