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At least 320,000 viruses are still undiscovered in mammals.
Elephants are the only mammals, besides humans, to have chins.
All mammals take about 21 seconds to pee.
Bats are the only mammals naturally capable of flying.
Pollution kills more than 1 million seabirds and 100 million mammals every year.
In many mammals, goose bumps occur when facing a threat. We humans can get goose bumps when we experience awe.
Sea lions are the only non-human mammals that have demonstrated the ability to keep a beat.
Armadillos are the only living mammals that have shells.
Mammals remained relatively small until 65 million years ago, when thedemise of the dinosaurs gave them a chance to survive.
The Law of Urination says that all mammals, weighing more than 2.2 pounds (a kilogram), take almost the same time to pee: about 20 seconds.
Most mammals, from elephants to shrews, live for the same number of heartbeats, about 1.5 billion, before dying.
Only three known mammals experience menopause: orcas, short-finned pilot whales and humans.
Reindeer are one of the only mammals that can see UV light, allowing them to see lichen, polar bears against the snow, and urine trails.
Humans are the only mammals that develop breasts that are permanently enlarged.
Within only 2,000 years of humanity’s arrival in the New World, indigenous peoples drove to extinction 84 of the Americas’ 107 genera of large mammals.
The baculum (or oosik) is a bone in the penis of most mammals, notably absent from human males.
Dolphins and Humans are the only mammals that have sex for pleasure.
The polar bear is one of the only large land mammals that has absolutely no fear of man. It will stalk people at every chance and has been known to charge large groups of hunters, sometimes into heavy gunfire, not slowing down even after its vital organs have been hit repeatedly.
Garter snakes, though reptiles, do not lay eggs. They bear live young, just as mammals do.
The weasel and the ermine are the same animal. This mammal’s coat changes with the seasons—in its white winter coat it is known as an ermine, in its brown coat it is a weasel.