Nearly 200 people shed their clothes and ran through London Zoo last night.

Ham & High: Dozens of runners took part in the run at London ZooDozens of runners took part in the run at London Zoo (Image: Archant)

But they weren’t breaking the law - in fact they were raising vital funds to support the zoo’s work with tigers.

Now in its fourth year, the annual ZSL London Zoo Streak for Tigers raised £25,000 to support conservation work.

A group of tigers is known as a streak, so it seemed an appropriate way of collecting cash.

Over the past four years, money raised from the Streak for Tigers has enabled ZSL to increase the number of camera traps to track and monitor tiger populations in the wild.

Ham & High: Dozens of runners took part in the run at London ZooDozens of runners took part in the run at London Zoo (Image: Archant)

The funds have also supported teams of park rangers and local community members to patrol protected areas, remove snares, and watch for poachers, with the aim of protecting these big cats and their habitats.

James Wren, fundraising director at ZSL, said: “Now in its fourth year, the Streak for Tigers has raised more than £165k to date.

“We’re thrilled to hold such an unusual event, and that so many big cat fans dare to bare all to help us protect tigers.”