Even a croc must be cautious

Suppose you’re a crocodile and you want to cross a river. What would be better than avoiding water altogether by walking on the back of hippos? Nothing, except that hippos are not zebras. Click on the picture to see the whole story.

After all, there is no surprise when you know that, in Africa, the hippo is the worst wildlife killer of men.

Photograph: Vaclav Silha/Barcroft, for Guardian.co.uk.