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Police have revealed more characteristics of a man whose head was found at Porpoise Bay on Rottnest Island.

The human head was found washed up in a plastic bag by a family who were beachcombing in the area.

Examiners at the State mortuary believe the head is from a Caucasian man aged between 30 and 60 years old, although police have stressed the age range is not definitive.

Today, police said the man was missing seven of his front upper teeth and did not wear a plate or dentures. His other teeth were also in poor condition.

The man's teeth had missing for several years.

The man had a moustache and full beard that extended below his chin.

He did not have any ear, nose, lip or tongue piercings.

Police would not reveal how the man died and that this stage have no indication when he died

They have not identified any other site to search and are still trying to identify the man.

Police and State Emergency Service volunteers ended a land and ocean search of the southern side of the island yesterday.

They collected some personal items although it is not known whether they have any connection with the remains.

Crime Stoppers is assessing and investigating several calls from the public after police made a plea for information.

Those who have information that could help the investigation are asked to call Crime Stoppers on 1800 333 000.