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Multilevel selection is a controversial concept originally proposed by Darwin. A new study found evidence for it in the wild in a group of marmots scientists have been observing for more than 60 years ...

This comes as the insects are rapidly declining and are under consideration for Endangered Species Act protections.

in a vale in the Rocky Mountains, a scene from another century plays out. Dozens of rugged-looking men mill around an encampment. They tether their horses and mules to trees. They wear animal ...