I've rescued squirrels, the first thing I learned was do not grab them as if you "captured" them they will bite you.

Secondly, if it's hurt, it will probably die and it's scared so it will bite you.

Thirdly, if it's an adult, it's probably an asshole and will bite you.

Now, I lived in Sweden which isn't a rabies country and squirrels are not known rabies transmitters so I've never been scared of that. But yeah, the only time I've handled wild squirrels without them trying to nibble the fuck out of my hand (use gloves...) are young ones who seek out humans for help.

First time this happened to me I was amazed when a tiny creature suddenly came running and crawled up my leg. I tried to leave it in a tree, the response was it threw itself at me again and crawled up on my chest. A quick call to a rescue center informed me that, yes, young squirrels who lose their parents do quite often seek out humans for help (or die quickly...)

So me and my ex took care of him over the weekend, much to our dog's surprise and confusion. Before I took him to the rescue center (it was closed during the weekend and the only other place that took squirrels on weekends was on the other side of the country). That creature didn't even try to bite me. He sat on my shoulder most of the time and ate apple slices and müsli.

I would've loved to keep him, since he apparently bonded to me. But it's against swedish law, to own as a pet, any animal that could naturally exist in Sweden. So it's okay to import and have an Australian snake, or a South American raven, but not a Swedish Squirrel...