It's not often you're allowed — nay, invited — to strip off in a Royal Park, but ZSL London Zoo is asking Londoners to do just that this week.
The zoo's annual Streak for Tigers is back, with 300 runners doing a naked lap of the zoo to raise funds for the charity.
Fancy taking part? You won't be out in the wilds of Regent's Park itself, but in the (even wilder) confines of the zoo. The event takes place after the zoo has closed for the night, so no chance of tourists catching sight of more than they bargained for.
You'll be wearing nothing but your birthday suit from the neck down (save the compulsory pair of trainers), but you'll be provided with an animal ears and mask to wear as you run. Feeling shy? You'll be among 299 other equally naked people — it's all part of the fun.
Spectator tickets are available, but only to family and friends of those taking part in the event.
As with past years, money raised by this year's event will go towards supporting ZSL's tiger conservation work. After the run, participants will be given an exclusive talk about the animals over in the zoo's Tiger Territory.
Streak for Tigers takes places on 10 August from 7pm. It's £20 to take part, plus a fundraising pledge of £150, and you'll need to sign up in advance. Over 18s only. Spectator tickets are £15.