I live in florida and had a huge avacado tree that the hens loved to sit under in summer. they would peck the fallen avocado's to open the skin and eat all the flesh. they left the cleaned skin in tack and the pit. never lost a hen.back when i had my only a cochin rooster i gave him a lemon quarter. he looked sideways at it then shook his neck feathers and walked away, clearly saying yeah that's gonna happen. befoe i knew about avocado i lost two birds to it. and good to know about buttercups. my chickens won't touch it. good thing too because i did not know it was toxic.