Rat

Rats are enemies encountered throughout the Crash Bandicoot series. Rats made their debut in the first Crash game.

Crash Bandicoot
Rats are found in Lights Out and Fumbling in the Dark. Only their red eyes can be seen in the darkness. They move in packs, like Skunks towards Crash and fall off the end of the path.

Crash Bandicoot 2: Cortex Strikes Back
Rats appear more in the sequel, in the levels Road to Ruin, Ruination, Night Fight and Totally Fly. Rats in this game have big eyes, this is probably because they are found at night. Rats behave differently as well, some stay still others move back and forth.

Crash Bandicoot: The Huge Adventure
Rats appear in the sewer levels of the game. They simply move from left to right.

Crash Twinsanity
Rats were not seen again until Twinsanity. Rats are found in almost every part of the game, they are first seen in the caves of N. Sanity Island, around N. Gin's Battleship, on the grounds of the Academy of Evil, in the underground Boiler Room and finally on the rooftops of the academy. The only place they do not appear is obviously in the Tenth Dimension, since there is no native fauna on Twinsanity Island.