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How to tame a rat
Give the rat some time alone.
You should leave a new rat alone in its cage for the first few days you have it. This will help them become comfortable with their new surroundings without the added stress of interacting with you.
If you get a rat that was handled since birth, bonding with it can happen in the first couple weeks or days. They should take treats straight from your hand after the first couple days and will be very easy to handle.