If you've mistaken Japanese beetles for fig beetles, then your hen could have been poisoned. It pays to identify what is lying about that your chickens may be tempted to eat. https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=43356
Last year, two eight-week old chicks of mine were poisoned by a buck moth caterpillar that had been dropped from a tree by a wild bird that dropped it when it stung its mouth. Both chicks suffered paralysis before dying.
Last year, two eight-week old chicks of mine were poisoned by a buck moth caterpillar that had been dropped from a tree by a wild bird that dropped it when it stung its mouth. Both chicks suffered paralysis before dying.