eli5: How are animals able to know that grown foods not native to the area are able to be eaten?

Question

eli5: How are animals able to know that grown foods not native to the area are able to be eaten?

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Answer 1

They don’t, they typically eat it and find out.

Similarly, my dog will eat random then things he finds on the floor that smell like “food” and his own vomit for what that’s worth.