Wild Plants Harmful to Ducks

[tia]

Does anyone know anything about wild plants that are harmful to ducks. I was wondering about cow parsnip or we call it wild celery here in Alaska.

 

[Amiga]

Cow parsnip I don't think of as dangerous (we don't have it on my place), but sometimes hemlock (not the tree, the herbaceous perennial) may look a bit like cow parsnip early on, and hemlock is indeed toxic.

Aside from hemlock, nightshades are also a concern.