New activity trackers for dolphin conservation

Just like a smartwatch can tell its wearer how many calories they consume during exercise, data from dolphin wearables can now be used to estimate how much energy dolphins use when they swim.

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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