Second-fastest animal

Everyone knows that the cheetah is the fastest land animal in the world – but what’s the second-fastest? And why is it so fast?

Yathin S Krishnappa / CC BY-SA

The pronghorn, also known as the American antelope, is built for speed. It has shock-absorbing toes, hollow hair, thirteen “gears” (gaits, i.e. leg movement patterns), and takes huge gulping breaths to fuel its push. The pronghorn is the Maserati of even-toed ungulates.

The cheetah can manage short bursts of up to 112 km per hour, but that doesn’t last more than a hundred metres before it has to slow down. Over longer distances its speed is more like 64 km per hour, and the pronghorn has that beat: it can go 88 km per hour for close to a kilometre, or 56 km per hour for 6 km.

Just to give you an idea of how ridiculously fast this is, a pronghorn could run the main span of the Golden Gate Bridge in less than a minute and a half. Pronghorns have been recorded taking single strides 7.3 metres long – that’s longer than a giraffe is high. So I suppose that means they could jump over a giraffe that was lying down… the hard way (hoofs to head)!

But here’s the thing – why does it need to be so fast? The cheetah has to be fast to catch its prey, but the pronghorn is a vegetarian, and there are no predators in North America that are anywhere near as speedy. One hypothesis is that there used to be predators fast enough to catch it – the extinct American Cheetah (Miracinonyx trumani) is a good candidate – so the pronghorn evolved to outrun them. And now that the American Cheetah is gone, they’re left to speed on their own.

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