Wolves communicate more by gazing than less social species
“Form equals function” is a fundamental principle of biology. It means that the physical characteristics of a body part are associated with its purpose and that we can predict the function of something by paying attention to what it looks like. When we see the very long, lean muscular hind quarters of a Greyhound and compare them to the same body parts on a Bichon Frise, we can figure out which of these dogs would win a race between the two. Similarly, when we compare the large ears of bats with those of squirrels, it’s easy to conclude that bat hearing is far more acute than squirrel hearing.
via Whisker Therapy