Rodents are mammals.
There are many species of rodents in Australia, most commonly the black rat, brown rat, pacific rat, house mouse & five-lined palm squirrel.
They all have large incisors that continue to grow every day, they gnaw on things to keep them trim and sharp.
Most rodents are herbivors meaning they eat plants, nuts and seeds, however, there are some that are omnivors which also eat small insects and frogs etc.
Rodents are usually quite small creatures with small arms and legs.
Rodents are best known for their ability to carry and spread disease, rats being responsible for the black plague which struck the UK in the 14th century and wiped out a huge portion of the population.
They are also very smart, rats can even learn tricks.
Rodents are also biologically similar enough to humans that they are often used in scientific testing.
They are not harmful to humans generally, but they cause a lot of damage to properties especially structure and wiring.
Most of the damage done by rats is structural in that they gnaw at walls and wiring.