I have frogs in my garden, but I am not sure excatly how to identify the species. I think they are either common frogs (Rana temporaria) or moor frogs (Rana arvalis). Very lively too. They like it round my compost heap.
They are greeny brown, about 2 inches long, and have a very prominent black mask that makes them look like a burglar. ;D
Some of he photos of common frogs show a mask, others not, hence the confusion.
Anyone know how to tell the difference?