Mammals Revealed - Discovery and Documentation of Secretive Creatures


Mammals crawl, dig, walk and run across equatorial rain forests and polar ice caps. Winged bats fly through the night, guided by their system of ultrasonic clicks that are too high for humans to hear, while finned behemoths glide through the ocean depths trading subsonic songs that travel for miles. Mammary glands give mammals the ability to feed their young milk, and, along with a furry coat, define this order of at least 5,416 species. This group—mammals—touches us like no other because we are one of them, a hairy, breast-feeding mammal.


This tree shows the evolutionary relationships between the major groups of mammals. The base of the trunk represents the earliest mammal 165 million years ago, while the tips represent groups of modern species.


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