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This is Scientific American 60 Second Science. I'm Suzanne Bard.

Black rhinos have terrible eyesight. Even so, these giant African herbivores easily fend off hungry lions and hyenas.

Their basic body plan has proved to be good enough to survive in a savannah full of large predators, being very large, thick

skin, big rapier like horns.

Victoria University of Melbourne behavioral ecologist Rhone plots.

But those protective traits are no match for humans with guns.

Today, this species is critically endangered, largely due to poaching.

But the rhinos may have an unlikely

ally against poachers, the red-billed oxpecker. The chatty, sociable birds often hang out on the

backs of rhinos feasting on parasitic ticks. And actually research has shown that the tick

is the favorite diet of an oxpecker. And if they feed on

ticks, that is a good thing. The birds also get nutrients by picking its sores on the rhino's

bodies. Plots suspected that the rhinos put up with this indignity because the oxpeckers make

loud alarm calls whenever they see humans approach, giving the rhinos an early warning to flee.

And it's sort of a distinctive rattling, but hissing sort of sound.

To test whether the oxpeckers do in fact act as noisy lookouts,

plots and his team implanted radio transmitters in the rhinos' horns.

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