Here's why:
* Hunting Style: Hawks and owls are birds of prey that use their sharp talons to kill their prey. They often focus on the head as a quick and efficient way to end the animal's life.
* Leaving Remains: These birds don't always eat the entire prey animal. They might prefer specific parts like the brain and organs, leaving the rest behind.
* Behavioral Pattern: It's common for birds of prey to cache food, meaning they hide it for later consumption. They might take the head for later eating, leaving the rest of the rabbit untouched.
Other possibilities:
* Larger mammals: A fox or coyote might also kill a baby rabbit in a similar way, but they are more likely to consume the entire carcass.
* Snakes: Some snakes, like garter snakes, might kill a baby rabbit by constriction but might not eat it. They could leave the body intact.
It's important to remember that this behavior can be unsettling, but it's a natural part of the food chain.