An officer from Wildlife Victoria has saved a koala's life by giving it mouth-to-mouth rescucitation after a dramatic rescue.

The marsupial initially survived being hit by a car in Langwarrin last night and managed to climb up a large tree, where it became stuck.

CFA Langwarrin and Frankston fire brigades, together with a Wildlife Victoria officer, spent half an hour freeing the prone animal from a high branch, before it tumbled out of the tree and into the open arms of its rescuers below.

A Wildlife Victoria officer then revived the animal - whom they named "Sir Chompsalot" - using mouth-to-mouth resuscitation.