Honey Possums

Last updated: Monday 16 May, 2016

(Tarsipes rostratus)

Sweet is the life of the Honey Possum. This mouse-sized marsupial lives on a diet of nectar and pollen. It can drink 7 ml of nectar a day, which would be like a human drinking 50 litres of soft drink! 

Honey Possums eat nectar from flowers. Photo Jiri Lochman/Lochman Transparencies.
Honey Possums eat nectar from flowers. Photo Jiri Lochman/Lochman Transparencies.
Also known by its Aboriginal name Noolbenger (ngool-boon-gor), this creature is tiny. It weighs just 7 to 10 grams and has a tail (88 to 100mm) tha's longer than its head and body combined! 

Like the Pygmy Possum, the Honey Possum’s tail is prehensile – it can grasp  branches, enabling the animal to move nimbly through vegetation. A dark brown stripe runs across the noolbenger’s back, marking its grey-brown fur coat.  

The species is famous for its long snout – the genus name, rostratus, means ‘beaked’ in Latin. But its common name is less informative – they’re only distantly related to possums and they actually don’t eat honey! 

A sleepy Honey Possum at Chingarrup property in the Gondwana Link project. Photo Annette Ruzicka.
A sleepy Honey Possum at Chingarrup property in the Gondwana Link project. Photo Annette Ruzicka.
But, like a nectar-eating bird, they do have  bristles on their tongue tip, used to collect nectar from native flowers. The upper surface of the tongue is covered by brush-like bristles that collect pollen. At 1.8cm, a Hony Possum's tongue is almost one-quarter of its head and body length. 

Like a hummingbird, the Honey Possum’s tongue moves rapidly in and out of the mouth (at about three times a second). While these animals are expert climbers, and are mostly arboreal (tree-dwelling), they're also fast runners. 

Where do honey possums live?

The Honey Possum is endemic to the south-west of Western Australia. It’s a totem animal for some of the Noongar Traditional Owners of this region. 

Honey Possums live in Banksia woodlands, sandplain healthlands, shrublands and low open woodlands. The species is now extinct in most of the Central Wheatbelt, where much of this vegetation has been cleared.

Photo Annette Ruzicka.
Photo Annette Ruzicka.
Honey Possums are most abundant where vegetation hasn’t been burnt for 22 to 26 years: the population is double in these areas, compared to recently burnt sites.  

Ultimately, the animal's distribution is dependent on the number ('species richness') of different nectar-producing plants, and their time of flowering as they need flowers for their food supply all year round.

Internationally, the species is considered of Least Concern to extinction by the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. However, it’s protected fauna in Western Australia. 

Behaviour

Honey Possums are mainly nocturnal but on cloudy days they can be seen visiting flowers from dawn until dusk. They feed on banksias, bottlebrushes, heaths, grass trees and kangaroo paws. 

They’re the world’s only truly nectivorous (nectar-eating) marsupial. Because they have such a high metabolic rate, they need a year-round, continuous supply of nectar to survive. And plants need them: Honey Possums pollinate many plant species by transferring pollen collected on their head and body between flowers.

“The evolutionary trail of this animal is quite incredible,” says our ecologist Angela Sanders. “South west Western Australia is the only place in the world where they could have evolved. That’s because it’s the only place where pollen and nectar has been readily available for all 12 months of the year over such a long period of time.”

Male Honey Possums are smaller than females, but have extremely large testes (up to 4.2% of their body weight) and the largest spermatozoa of any mammal in the world!

Females give birth to two to three young – joeys – at any time of year, whenever food is abundant. Being a marsupial, the mother raises the tiny newborns in her deep pouch, suckling them until they’re about three months old. 

In cold or wet weather they can enter a state of torpor, conserving energy by lowering their metabolic rate and internal temperature. They sometimes huddle together in a cluster to keep warm. In the wild they have quite a short life-span, living 1 to 3 years. 

Threats

A hungry Honey Possum fuels up before being released. Photo Liz Tanner.
A hungry Honey Possum fuels up before being released. Photo Liz Tanner.
Habitat loss is the biggest threat to the survival of Honey Possums. They rely on a rich diversity of flowering plants so that at any time of year at least one species can supply nectar. 

Unlike nectar-eating birds and bats, they can’t fly to different areas to source flowers. Indeed, females with joeys are recorded to move less than 10 m over several months! Even brief food shortages can drive local populations to extinction. 

Associated threats are inappropriate fire regimes; the habitat loss from the water mould Phytophthora cinnamomi; and predation by cats and foxes. It’s also predicted that climate change will result in declining rainfall and increased wildfires in the region, adversely affecting honey possums and their habitat. 

What’s Bush Heritage doing?

Honey Possums live on several of our Western Australian reserves: Beringa, Chereninup, Chingarrup, Monjebup and Yarraweyah

We’re protecting the habitat of these noolbengers by removing stock, controlling feral herbivores ( rabbits) and revegetating cleared land with proteaceous plant species, which is their preferred food.

Protect Hamelin Station
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