One of the most interesting things I have observed about roosters is that they not only alert the hens to danger, they warn about the type of danger. They make one noise if the predator is an overhead predator such as a hawk, and a completely different noise to indicate that the predator is on the ground, such as a coyote. This allows the hens to make the best choice about which kind of shelter to take from the predator - whether to get inside the hen house or under a bush.
One of the most interesting things I have observed about roosters is that they not only alert the hens to danger, they warn about the type of danger. They make one noise if the predator is an overhead predator such as a hawk, and a completely different noise to indicate that the predator is on the ground, such as a coyote. This allows the hens to make the best choice about which kind of shelter to take from the predator - whether to get inside the hen house or under a bush.