I put a mop bucket in the garden about a year or so ago... I forget exactly when. It rained, filled with water over time and now there are frogs living in it. Well, I say living in it... when I go outside for a smoke, I've seen frogs in it a number of times... so I presume they're either living in it, or they're using it as a leisure pool.
Unfortunately since the hedgehog incident of 2009 my wife and I have had the agreement that if wildlife inhabits something in the garden, that something must remain... although I pointed out the hypocrisy when we discovered rats beneath the shed. I was instructed to dispatch the rats by whatever means.
I am amazed, considering that I live in quite a densely populated village just how much wildlife we have in our garden... in the past few years I've seen bats, squirrels, hedgehogs, mice, rats, a variety of birds, something that was identified on here as a newt and frogs... and thats before we get onto insects and arachnids. The strangest wild thing that has visited our garden is an animal that growled, snarled and rustled its way through the side bushes... I presume it was a fox or maybe a badger, but it scared the beejeebers out of me at the time.