Pogrebin

The Pogrebin (Homunculus Pogrebatus) are a species of semi-sapient Little People.

Physical Description
Pogrebins are about a foot tall, presenting a humanoid appearance. Their body is covered in thick brown hair, they have two protruding fangs, an almost flat nose, and, most noticeably, a large protuberance of their skull resembling a rock about as wide as the Pogrebin is tall.

Behaviour
Pogrebins are solitary predators with only the barest hint of a culture and society (owed to their very low intelligence, about on par with Gnomes' and Trolls'; there are no recorded instances of a Pogrebin speaking intelligible words, for one thing). Pogrebins have an efficient hunting technique in crouching down on the floor (partially burying their lower body if need be), appearing as nothing more than a rock, until an unsuspecting prey comes nearby. Urban legend has it the Pogrebin will follow the unwary traveller down lonely roads, giving him a feeling that he is followed but crouching down everytime he turns round, until the poor man is so devoured by paranoia and despair that he crouches down, allowing the Pogrebin to leap at him and devour him. This behaviour is largely fictional; travellers observing Pogrebins following them and hiding when they turn round merely saw unusually curious specimens — such forward thinking as trying to induce despair is almost certainly beyond the Pogrebin's limited mental capabilities.

Magical Abilities
Pogrebins' entire magic is focused on enhancing their neck strength, allowing them to carry the rock-like protuberance of their head. They are almost defenseless otherwise, being easily repelled with so much as a kick.

Habitat
Pogrebins live in the Russian plains.

British Ministry of Magic Classification
The British Ministry of Magic classes Pogrebins as Beasts, giving them the threat level of XXX.

Canon

 * Pogrebin on the Harry Potter Wiki