I don't know if they are dangerous to grown chickens, but they certainly are pests! And my chickens are afraid of them. A flock of ravens (I'm pretty sure they're ravens instead of crows) has been landing in my yard near the chicken run for the past couple days. They usually arrive in the late afternoon and stay a couple hours. This makes my chickens hide under the coop the whole time they are there. The ravens walk up really close to the run and peck around, then walk some more, fly away, come back, etc. They don't seem to be trying to enter the run. They do eyeball the chickens and scream at them. I assume the chickens have kicked some of the corn I use for scratch outside the run and perhaps that interests the ravens too. I've tried going outside and chasing them off, which only works for a short time. I've tried using reflectors (pie plates, CDs) to scare them off, which works but the chickens are scared of them too so that doesn't really help much. Thoughts and ideas are appreciated!