Hibernating insects regrow muscles on demand

Even as gas prices soar, most people don't destroy their car's engine just to save energy—and that's one luxury certain insects have that those humans don't.

Hummingbirds may struggle to go any further uphill

Any animal ascending a mountain experiences a double whammy of impediments: The air gets thinner as it also becomes colder, which is particularly problematic for creatures struggling to keep warm when less oxygen is available. ...

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