I have been told most of life that the little plant that looks like an onion and has the purple flowers is crow poison. I think they were confused because they have me confused.
Are Grape Hyacinths Poisonous?
Certified GKH Gardening Expert
It looks like the confusion is widespread based on my research.
According to the ASPCA, the grape hyacinth is not poisonous to cats or dogs.
As for toxicity to humans, the University of Wisconsin, California and Utah published poison prevention literature that said it was not toxic.