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Scientists link humidity, microbes, and melanin to a pattern where animals in warm, wet climates develop darker feathers and fur.

Every multicellular organism, from tiny worms to humans, elephants, and whales, needs a way for their cells to connect with each other to form tissues, organs, and organize their overall body plan.

Discover why bison are unique to America’s grasslands and how WWF is working to restore large herds across the Northern Great ...

What are mandrills? Where do they live? What threats do mandrills face? Learn all about this 'old world monkey' in our expert guide ...