Q: Did you know that nandina berries are poisonous to cedar waxwings?

A: A recent observation of mass death among cedar waxwings was followed by a veterinary necropsy. The doctors found huge amounts of nandina berries in the cedar waxwing bird’s crops.

Feeding Behavior-Related Toxicity due to Nandina domestica in Cedar Waxwings

I’ll leave it up to you to decide if this is a major worry or not. I note that this phenomena had never been reported before….and a one-time occurrence is not usually enough to justify a call to eradicate all indicted plants.