mammalian

Etymology

From mammal + -ian.

adj

1. of, or pertaining to, mammals
   The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail. 2013 July-August, Fenella Saunders, “Tiny Lenses See the Big Picture”, in American Scientist
2. like a mammal

noun

1. Any mammal.