There are Many differenet kinds of Rats available.
Rats come in many different colours, markings, body types and temperments.
This is a generalization- it tends to be true, but there will always be the odd hyper male and lazy female. This markign consists of dripping a few drops of urine as they wander around. They have strait short fur in various colours and markings. They have small ears, a somewhat long body, and a long tail. Its hard to generalize these rats temperments as there is considerable variation.