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Articles on Mammals

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Bird flu is transmitted mainly by wild birds, like these snow geese in Ruthsberg, Md., in January 2023. Photo by JIM WATSON/AFP via Getty Images

As bird flu continues to spread in the US and worldwide, what’s the risk that it could start a human pandemic? 4 questions answered

Avian influenza viruses have evolved to infect birds, but the current H5N1 outbreak is also infecting a wide range of mammals. This suggests that it could mutate into forms that threaten humans.
Tritylodon, a therapsid, reconstructed as a night dwelling warm blooded animal. Note the steam coming out of its lungs. Illustrated by Luzia Soares

Mystery solved: when mammals’ ancestors became warm-blooded

Warm-bloodedness is the key to what makes mammals what they are today. That’s why working out when it emerged in mammal ancestors matters.
A Bohemian waxwing eating mountain ash berries. Lisa Hupp, USFWS/Flickr

With fewer animals to spread their seeds, plants could have trouble adapting to climate change

Forests around the world will need to shift their ranges to adapt to climate change. But many trees and plants rely on animals to spread their seeds widely, and those partners are declining.

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