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To figure out how they should operate, Gan looks to animals such as horses and tiny hopping rodents called jerboas.

This type of “cutting the brakes” approach seems to be another key component of the jerboa’s huge hindlimbs, the team reports.

Zoo officials said that they had put five jerboas, a type of hopping rodent with long hind legs, into specially refrigerated enclosures to encourage them to hibernate.

In her laboratory at UCSD, she and her colleagues study the evolution of the jerboa, a long-legged rodent with a jumping, bipedal gait, which diverged from the mouse lineage tens of millions of years ago.

The desert much is reddish in colour, and comes alive at night with various insects, lizards and jerboas hunting.