There are different methods to offer treats to aggressive rats who might bite. Protect your hand! Do not attempt these without first assessing the level of aggression with the rat.

Rats are primarily food-motivated, so successfully offering treats to a frightened rat is one way to win his heart. If this human doesn't hurt him, but is the source of yummy noms, then maybe this human isn't so bad.

This gallery's focus is on the narrow topic of giving treats. However, much more needs to happen in terms of relating to the rat to help him over the hump of fear.