Have no idea. but will they kill your chickens...possibly.
We had a woolly bear caterpillar in our chicken coop, they would look at it but not touch it. Then our black Silkie and 1 of our Speckled Sussex decided to share it. 10 min after consuming looked like they were having some respiratory issues and became lethargic. Not much we could do, they had no problem going in for the night and roosting. But in the morning found them in the nest boxes and they had passed away. So are they poisonous, do not know but do they have difficulties after consuming ...most definitely.. Hope this helps others
We had a woolly bear caterpillar in our chicken coop, they would look at it but not touch it. Then our black Silkie and 1 of our Speckled Sussex decided to share it. 10 min after consuming looked like they were having some respiratory issues and became lethargic. Not much we could do, they had no problem going in for the night and roosting. But in the morning found them in the nest boxes and they had passed away. So are they poisonous, do not know but do they have difficulties after consuming ...most definitely.. Hope this helps others