The Jobberknoll is a small, blue speckled bird that never makes any noise until the moment before it dies. It then lets out a long scream, which consists of every sound it ever heard backwards. Jobberknoll feathers are used in Truth Serums and Memory Potions.
Mooncalf (XX)

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 that confuse Muggles.

Mooncalf dung, if harvested before the sun rises, will make magical plants grow fast and strong.