Constable Scott Mason's world has changed - with a new baby and a orphaned kangaroo coming into his life in the same week.

The constable, who is stationed in Cue, 650km northeast of Perth, ended up with the Joey after its mother died when she was hit by a truck.

The joey survived the impact inside its mother's pouch and was rescued. It has now latched on to the local constable and hops around the police station following Scott wherever he goes.

Video of the joey climbing into the Scott's t-shirt as if it was a pouch has been posted on the WA Police Facebook site: