We have very agressive ground squirrels, in a specific area, because tourists feed them and they have become habituated.
Unsuspecting persons, sitting and having a snack, can have squirrels practically jump in their lap in hopes of a nibble.
It's a bad thing because often children have been bitten on the hand. There are signs posted instructing the tourists to avoid feeding animals--it is punishable by a fine, but they don't care. So now the squirrels are a pesky problem. And some of them carry a plague-a type of bacterial infection, so if you are bitten, you have to go to the clinic and get a shot.
Keep the "wild" in wildlife!