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

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

In cats, the same traits can be seen in Persian, Himalayan and Burmese breeds. When convergence occurs through natural selection – such as in the development of wings in birds, bats and insects ...

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

In the case of domestic cats, dogs and many other domesticated species, intentional and unintentional selection by humans ...