Squirrels can bite really hard. I had one biting my wrist once, i had to slap the bugger off. Missed my artery (is that the correct word) by less than a centimetre too, little sh!t. It was laying groggily on a road, i wanted to put it elsewhere to avoid it ending up on some spicy roadkill dish.
Squirrel gratitude – yeah, right. I would mistreat my next squirrel just as bad as that one.