What fruit is poisonous to ALL animals?
I doubt there is any fruit poisonous to all animals. A donkey has been known to eat an estimated eight pounds of Deadly Nightshade – fruits and all – with no apparent ill effects. Birds will eat the berries too, but they are very poisonous to dogs. Species of flea beetle will nibble the leaves. Yew berries are extremely poisonous to many creatures including humans but some birds eat them with impunity. You have thrown up an interesting question but I doubt you’ll get an answer in the positive.
