Winter coat color determines species survival in a changing climate

We’ve all seen pictures of a bright white arctic fox or snowshoe hare in a snowy landscape. But did you know, these same animals actually have brown coats during the summer? The ability of animals to change their seasonal coat color enables them to camouflage themselves against the landscape year round. A decrease in the duration of winter snow cover is one of the most widespread signals of climate change. Without snow, bright white arctic foxes and snowshoe hares will be obvious to predators and have decreased survival. A recent study reports that populations that have a mix of individuals with either brown or white winter coats may be better able to adapt and persist during this age of climate change.

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Birds evolve bigger beaks thanks to backyard feeders

Echoing Charles Darwin’s study of Galapagos finches, biologists in Great Britain have found that the size of birds’ beaks is adapted to help them eat certain types of food. But unlike Darwin’s finches, the British food sources influencing bird evolution aren’t natural features of the environment. They’re backyard bird feeders.

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