Flat-faced dogs and cats have been bred to such extremes that they now look more like each other than their own ancestors, ...

Through intensive breeding, humans have pushed breeds such as pug dogs and Persian cats to evolve with very similar skulls ...

Aposematism refers to animals with obvious defense mechanisms, letting other predators know they're in for trouble.

Senescent skin cells, often referred to as zombie cells because they have outlived their usefulness without ever quite dying, ...