I went to get new gravity fed cat/dog feeders today to put the oyster shell in for my hens. The silkies didn't appreciate it and wouldn't go near it. My layer flock all ran over to check it out. My rooster chased the girls away and examined the new thing and then called all the girls over to eat the shell. Silly rooster. Managed to snap a picture of them examining it with the rooster watching over.