There are many ways...
Train a dog to watch them and mammals sure their trained.
This one helped me the most, but not everyone can have this or want this but if you can get a rooster, they are noisemakers so it scares hawks away and I can't hear mine from inside they also have spurs for protecting his hens.
This one works almost all the time but make a run for your chickens with netting or hard wire (not chicken wire)
This one is mainly for hawks but get old CDs and hang them up near the coop or get scare crows Hawks Hate them.
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