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A new study suggests chimpanzees don't just perform self-care—in some cases, they look out for each other. Elodie Freymann Chimpanzees use medicinal plants to perform first aid on others, according to ...

Researchers analyzed nearly 200 whale-dolphin interactions, and conclude: They sure do seem friendly. Humpback whales (Megaptera novaeangliae) like the ones pictured here with bottlenose dolphins ...

A humpback whale stays by the side of a whale entangled in fishing gear. He spent more than five hours by her side, swimming below her and raising her to the surface to breathe. Photograph By Dan ...