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Sloths spend most of their time eating, resting, or sleeping; in fact, they descend from their treetops canopies just once a week, for a bathroom break. How are these creatures so low energy? Kenny Coogan describes the physical and behavioral adaptations that allow sloths to be so slow.

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Can wildlife adapt to climate change? - Erin Eastwood

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With rising temperatures and seas, massive droughts, and changing landscapes, successfully adapting to climate change is increasingly important. For humans, this can mean using technology to find solutions. But for some plants and animals, adapting to these changes involves the m…

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Newsela | Ever wondered about animals that light up?

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Some bioluminescent animals create light within their bodies. This technique is used for feeding, protection and communication. Bioluminescence requires three main ingredients: a molecule called luciferin, oxygen and the enzyme luciferase.

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Newsela | Big Questions: Why are polar bears' hairs so fair?

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Although polar bears' fur looks white, it is really see-through and the skin underneath is black!

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Newsela | Bioluminescence: a chemical reaction that lights up fireflies and jellyfish

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Living organisms emit light through a chemical reaction in their body.