Biometry, or Biometrics, the application of statistics to the study of living things. Biometry is especially useful in studying growth or biological similarities and differences. It is a vital part of insurance, public health, forestry, and many other fields.
Humans can certainly claim some of these, but sloths, giraffes and pandas wanted a piece of the action, too. The hyena adaptation, however, may just blow your mind.
Sometimes you meet someone who smiles at you and exchanges pleasantries, but you still walk away feeling certain that you don't like him or her. You're not nuts -- you might be picking up on microexpressions.