Animals
Trotting hippos can 'fly,' but only in 0.3-second bursts, study finds
Hippos weigh as much as a medium-size car, but that doesn't stop them from completely lifting off the ground when hitting top speeds, new research has found. Turns out, these bulky creatures can go airborne for "quite a large amount of time," scientists say.
The finding comes from the first ever study on hippo locomotion, published July 3 in the journal PeerJ. The researchers revealed that the common hippopotamus (Hippopotamus amphibius) uses a two-beat gait called a trot, in which diagonal limbs move forward at the same time. That's different from some other four-legged animals like elephants, which walk using a four-beat gait with the sequence left hind foot forward, followed by left front, right hind and then right front.
"Hippos basically only trot," study lead author John Hutchinson, a professor of evolutionary biomechanics at the Royal Veterinary College in the U.K., told Live Science. "And what's neat about that is that they do that throughout their whole speed range, as far as we can tell, which is unusual for Animals."
Other animals, such as horses and rhinos, transition from a trot to a canter or gallop, which involve an aerial phase. But hippos prefer to trot even at high speeds of 15.5 mph (25 km/h), while also going airborne in between strides, Hutchinson said. The creatures can lift off the ground for 0.3 seconds at a time, which is "quite a large amount of time" when you consider that hippos take up to three strides per second, Hutchinson said.
Related: Is hippo milk really pink?
To examine hippo movement, Hutchinson and his colleagues analyzed footage of two Animals they recorded at a zoo in England and 30 more Animals documented on YouTube. "If you click through a video of a hippo moving frame by frame, and this is something we were excited to see, you do notice that yeah, wow, they're going airborne and staying airborne," he said.
This means hippos have greater athletic capabilities than elephants, which do not become airborne, Hutchinson said. Going airborne probably enables the limbs to act like springs and store elastic energy in the tendons, giving hippos a bouncing gait that is more efficient and potentially faster than staying on the ground, he said.
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