Mooncalf

"The Mooncalf is a shy creature that only comes out of its burrow
during a full moon. The Mooncalf has smooth, pale grey skin, and
four spindly legs that end in large flat feet. The Mooncalf also has
bulging eyes that sit on the top of its head.Once the Mooncalf is in
the moonlight, it performs complicated dance moves standing on its
hind legs. It is believed that this is part of the Mooncalf mating ritual,
but also has the side effect of creating geometric patterns in wheat
fields.Mooncalf dung, if harvested before the sun rises, will make
magical plants grow fast and strong."

                                                                                     
                                                                                      J.K. Rowling