The animal that leaves the head of it's prey is the Red Fox.
Sometimes a hawk will leave the head of the prey or it may take the head with it.
Raccoons are also known to rip heads off chickens through fences and then leave it's body on the other side of the fence.
The red fox is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, plus parts of North Africa.
It is listed as least concern by the IUCN.
Foxes are not dangerous and do not attack humans, except when they are rabid, which is very rare, or when they are captured and handled.
Even then, a fox's natural tendency is to flee rather than fight.
Unfortunately, this unique animal is one of the rarest mammals in North America and is now limited to only two tiny California populations that likely consist of fewer than 50 — and possibly even fewer than 20 — individuals.
Foxes are normally wary and unlikely to approach humans.
However, if fed by a person, they can become conditioned to approach people and may appear to be a threat.
They may prey on poultry, lambs, piglets and small pets.
They can carry diseases and parasites that may infect people or their animals.