Related topics: species · mammals

Untangling the branches in the mammal tree of life

The mammal tree of life is a real leaner. Some branches are weighed down with thousands of species—we're looking at you, rodents and bats—while others hold just a few species.

Oxygen shaped the evolution of the eye

Convergent origins of new mechanisms to supply oxygen to the retina were directly linked to concurrent enhancements in the functional anatomy of the eye.