They grow in clusters so it would be easy to remove them.
This paragraph is from Wikipedia:
Toxicity[edit]
All parts of the plant are poisonous, containing hydrocyanic acid, and could potentially be fatal if ingested. The plant is placed in Toxicity Category 4, the category "generally considered non-toxic to humans,"[4] however, the berries are considered toxic to cats and grazing animals.[5] The berries also contain alkaloids such as nantenine, which is used in scientific research as an antidote to MDMA.[6][7] Birds are generally not affected by these toxins and will disperse the seeds through their droppings. However, excessive consumption of the berries will kill birds such as Cedar Waxwings.[8]
http://en.wikipedia.org/wiki/N...
Hopefully what you saw was just an isolated incident. I have never had a problem, but I do not ever see Cedar Waxwings.
