Puffer Fish

I noted today at Marion Bay a small number of dead Kelp Gulls and one dying. While probably not connected (except in my mind!), I also noted a number, maybe 10, Puffer Fish dead, which I assumed were discarded from fishing nets. However, I later photographed the live one seen here, apparently in good health. I'm fairly certain that they are poisonous to eat, at least to humans (I think it is possible to eat them but you have to know how to prepare them). Does anyone know if they're toxic to birds? I suspect the two 'events' are coincidental.

Before anyone points it out, the juvenile gull with a dead Puffer Fish is a Pacific Gull!