Is this cos they see them as a threat to their eggs or are they just blood thirsty like Horses when they chew on a mouse lol
They’re bloody predators if they feel like it. Even the chicks are dangerous to smaller animals.
Chickens are omnivores. In addition to grains, seeds, fruit, and insects, they’ll happily eat snakes, lizards, mice, baby birds, even adult birds if the bird is already injured. If they can kill it, they’ll eat it, and they are remarkably proficient at killing things.