CLABBERT 

"The Clabbert is a tree-dwelling creature, in appearance something like a crosss between a monkey and a frog. It originated in the southern states of America, though it has since been exported worldwide. The smooth and hairless skin is a mottled green, the hands and feet are webbed, and the arms and legs are long and supple, enabling the Clabbert to swing between branched with the agility of an orangutan. The head has short horns, and a wide mouth, which appears to be grinning, is full of razor-sharp teeth. The Clabbert feeds mostly on small lizards and birds.

The Clabbert's most distinctive feature is the large pustule in the middle of it's forehead, which turns scarlet and flashes when it senses danger."

-J.K Rowling