[Brambles]

I feel that chickens will know what is poisonous to them... they are virtually wild birds after all... I have brought up 7 children with lots of foxgloves in the grounds, a laburnum tree and a "churchyard yew" in the small garden that we had when they were small... They were taught what pods, berries and plants they could eat and what was definitely a no-no...    Until they were old enough to understand, Mum or Dad were closeby to watch over them... Bit like a 'mother hen!'