Chickens eat your crops

I think it would be very cool if chickens had a 50% chance of attempting to eat your wheat crops if they are 5-10 blocks around them. They'd attempt to 'scratch' up the farmland in order to eat the seeds, it could take some time so they could be stopped or pushed away before they destroyed it. This could be a really interesting obstacle to avoid while making a farm, and give a good reason to protect your crops with fences or walls.