“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.
Source: FS – Dogs – TBM
Canid Sociality Seen In Their Eyes