There are 300 Sumatran tigers left in the world. That's a bad thing.

People (London Zoo) want money to make more tigers. That's a good thing. And a cause I'd love to support.

It's not a simple matter of them being a bit rubbish or Darwinian competition - it's humans coming and purposely killing, maiming and damaging them and their ecosystem. We did this.

Apart from being ethical to somehow right our species' wrong, it's also important to make sure that ecosystems don't change quickly and stop supporting all the other local wildlife. Small but rapid changes affect us all.

So that's me trying to guilt you into giving money, trying to justify why scientifically... And if you need one more reason:

I'm going to be naked. Painted as a tiger. Running through London Zoo. So pay me to be naked and I may honour requests from errant perverts.