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Honey Possum on Monjebup Reserve. Photo Kieran MacFarlane.
Honey Possum on Monjebup Reserve. Photo Kieran MacFarlane.

Honey Possums

Scientific name: Tarsipes rostratus

The world’s only true nectar-eating marsupial, with a diet of nectar and pollen.

Sweet is the life of the Honey Possum. It can drink 7ml of nectar a day, which would be like a human drinking 50 litres of soft drink!

Also known by its Aboriginal (Noongar) name Noolbenger (ngool-boon-goor), this creature is tiny. It weighs just 7 to 10 grams and has a tail 88mm to 100mm – longer than its head and body combined!

Like a 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.

A Honey Possum on Monjebup Reserve. Photo Katelyn Reynolds.

The species is famous for its long snout – the genus name, rostratus, means ‘beaked’ in Latin. But its common name is less informative.

Honey Possums are only distantly related to possums and don’t actually eat honey!

While these animals are expert climbers, and are mostly arboreal (tree-dwelling), they’re also fast runners.

Like nectar-eating birds they 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 Honey Possum’s tongue is almost one-quarter of its head and body length.

A hungry Honey Possum fuels up before being released. Photo Liz Tanner.

Like a Hummingbird, the Honey Possum’s tongue moves rapidly in and out of the mouth (at about three times a second).

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 heathlands, shrublands and low open woodlands. The species is now extinct in most of the Central Wheatbelt, where much of this vegetation has been cleared.

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, their 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.


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Honey Possum 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, heath, grass trees and kangaroo paws.

As 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.

A Honey Possum enjoying habitat on Monjebup North. Photo Angela Sanders.

“The evolutionary trail of this animal is quite incredible. 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.”
– Ecologist Angela Sanders.

A Honey Possum in hand. Photo Annette Ruzicka.

Male Honey Possums are smaller than females, but have extremely large testes (up to 4.2% of their body weight) and the largest sperm 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 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 to Honey Possums

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 moving less than 10m over several months!

Even brief food shortages can drive local populations to extinction.

Associated threats are inappropriate fire regimes; 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 and partnership properties: 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.

Donate today to help us continue this and other vital conservation work.

Stories about Honey Possums

BLOG 27/12/2019

Which is cuter – Honey or Pygmy Possum?

There’s some conjecture around which tiny marsupial is the cutest, Honey or Pygmy Possums. After seeing both popping up in the pitfall traps and nesting boxes blanketing the reserve, I can understand the debate. Over the course of five days myself and four other volunteers interacted with a broad cross-section of animals that had made homes for themselves in the newly revegetated areas.

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BLOG 28/11/2016

Honey Possum in revegetation site

Last week Angela Sanders led the annual south-west fauna surveys on Bush Heritage's partner property -Yarraweyah Falls. Owners Bill and Jane Thompson were thrilled when the team caught a female Honey Possum with pouch young in the revegetation site - a first for this area.

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BLOG 26/11/2015

Fitz-Stirling fauna

Our recent fauna survey kept us busy on the Gondwana Link Fitz-Stirling properties, with 260 pitfall traps working on 5 properties over 15 days. Our volunteers were thrilled to see honey possums and pygmy possums for the first time and some saw native bush rats. With variable weather the reptile activity was a bit slow, although we did see a few more active on the roads. A thunderstorm brought the frogs out and we caught a few in the traps the next day.

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