When I was in high school in the 1950s, a human was defined in terms of making tools and cultivating food. The idea that tool use is unique to humans has been disproven many times. Birds, apes, and some fish have all been shown to use tools. We even have examples of animals farming.
In 1967 studies were released showing that Attine ants were gathering fungi into groupings, and then using the fungi as their sole food source. Recent studies have verified that Attine ants get the amino acid arginine from the fungus that they grow in plots. The ants provide the moisture the fungus must have, and the fungus provides the arginine the ants need. This symbiotic relationship is one of many in the natural world that show a critical balance in the processes and workers that allows complex life to exist on Earth.
The definition of what is “human” from a scientific standpoint is very difficult, because complex chemical relationships exist in both the plant and animal kingdoms. These processes can duplicate what is considered to be unique to humans. Things like brain size also cannot be used because of the huge variations that exist among all living things.
Since we have observed animals farming, we know that even that is not a human peculiarity. In recent months scientists have found human remains with brain sizes smaller than what is usually ascribed to humans. So how do we define humans? Humans were created in the image of God, and that definition is the only one that really works. You can see it by observing a human’s ability to create art and music, to worship God, to feel guilt and sympathy, and to be able to learn to think and reason.
–John N. Clayton © 2017
Reference: Science News, November 11, 2017 page 4.