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The threat rhinos face from poachers in some parts of Africa and Asia is now spreading to the UK.
Rhinos face serious danger from people wanting their horns - often to use for medical reasons.
It's such a big problem that last year in South Africa 450 rhinos were killed.
And now zoos and wildlife parks in Britain have been told to be on high alert in case their rhinos are targeted by poachers too.
Ricky's been to Colchester Zoo in Essex to get the story...
Prince Will warns rhino poachers
Prince William has spoken out against rhino and elephant poaching, calling those who do it "ignorant, selfish and wrong".
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Burglar steals fake rhino's horn
A model rhino made of fibreglass has had its horn chopped off by a burglar at a game reserve in South Africa.
33 smuggled rhino horns seized
Officials in Hong Kong have discovered 33 smuggled rhino horns and elephant tusks worth over £1 million.
South African rhino poaching deaths rise
A wildlife charity says the number of rhinos killed for their horns has reached a record level.
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