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. ...

Animals evolved the ability to gallop 472 million years ago

Few human adults gallop; the equine gait tends to be the preserve of little kids mimicking horses or exercise classes. But for camels, lions and giraffes, galloping is a key fixture of their repertoire as they shift up through ...

How hunting robber flies snatch victims from the air

Robber flies snatch victims from the air using the same interception strategy as guided missiles and falcons, but how do they intercept airborne quarry when their view is obstructed by foliage and clutter? Researchers from ...

Walking efficiently takes next to no thought

Whether walking beside a lake or clambering a mountain, people adjust their strides to use the least energy possible. "People are continuously sensing their energy expenditure and adapting their gait to minimize costs," says ...

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