Good science is comparative. Because horses are hoofed herd animals, they have much in common with cattle and deer. Because they are mammals, they have much in common with raccoons and dogs. They are animals and so have much in common with octopus, birds and fish. Our lineage defines our form, but our behaviors can often be traced far back on the family tree. When we find common behaviors across different twigs of the family tree, we can know that we have found an ancient behavior and can often learn about one species by looking carefully at another. When a sandpiper, baby raccoon, or horse threaten, they all bend down, assume a snowplow position with their heads, and move forward. Surely animals have been threatening each other for eons. New species do not bother to invent new behaviors when the old ones work perfectly well.