Rat (species)
From Halopedia, the Halo wiki
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Rats are a species of rodent native to Earth, with the first "true" rats originating in Asia. They are distinguished from mice in their larger size and are often kept as pets or used for scientific study. Rats originaly eat plants, but they can eat many things such as meat and garbage. Rats usually have from 5 to 10 offspring in each pregnancy, which is why their population grows so fast.
Appearances
They appear on most of the Campaign levels set on Earth, as well as the Multiplayer map Rat's Nest in Halo 3, to tie in with the map, though all the rats found on Rat's Nest are already dead, likely due to the fact that they would appear on radar and confuse the players. It is possible to kill them and when killed they will roll around in a prone form. When they are shot at or encountered they will squeal characteristically and will appear as small yellow dots on your motion tracker. Rats can be killed and emit the same blood as marines. Rats have been noticed around the butchered area of the barracks on Crow's Nest, most likely feeding on the dead Marines.
