Cat That Thinks It's a Bird.

From the website:

When Wendy Hobbs spotted a cat up a tree in her garden a week ago, she was tempted to phone the fire brigade to get it back to earth.

But she soon realised that the tortoiseshell stray was there out of choice – and had set up home in a bird’s nest.

It leaves the flowering cherry tree to beg for food at the back door then, straight after its meal, climbs back up into the branches for a well-earned rest.

Link