Quarintine officers found the remains of a monkey in a parcel bound for Melbourne's western suburbs this week.
The package, sent from Thailand to Williamstown, was detected at the city's International Mail Facility at Tullamarine.
Quarantine officer Ken Ryan first noticed the "monkey meat" inside a 25cm square package during a routine inspection.
An X-ray revealed a torso and inspectors discovered a 12cm, decaying forearm and hand.
Although almost overcome by the smell, inspectors froze the remains and destroyed them yesterday.