Koalas

An iconic Australian marsupial, Koalas occur from the tip of topical Queensland, down the east coast of Australia to Victoria and South Australia.

By Diliff (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons

By Diliff (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons

Due to hunting, bush fires, drought, and destruction of habitat from agriculture or urbanisation, Koala populations have dropped significantly over the past century leading to them being listed as a Vulnerable Species in the Environmental Protection and Biodiversity Conservation Act 1999 in Queensland and New South Wales in 2012.

The Koala diet consists mainly of the leaves from a small number of Eucalyptus species, providing a high fibre, low-protein food source. Koalas feed often, as they are unable to store excess energy as fat. They rely on a slow metabolism and conservation of energy through sleep and resting. Koalas generally feed for two to four hours every day, usually in the evening, or in drier climates, in the morning to collect moisture from the dew on leaves.

Koalas generally show a preference for younger foliage, as it usually contains more nitrogen, moisture, and sugars than older, mature foliage. The palatability of certain species depends a lot on the available nutrient in the soil, as trees growing in poor nutrient areas tend to produce compounds in their leaves that deter feeding as a protection for their foliage.

Eucalyptus punctata (Grey Gum) - One of the Koala's favourite food sources.

Eucalyptus punctata (Grey Gum) – One of the Koala’s favourite food sources.

Koalas are relatively sedentary and localised in their movement. Females generally require a minimum 1 hectare of good quality habitat in areas of high soil fertility and good rainfall, while males require a minimum of 2 hectares.

Koalas are asocial animals, the only bonding occurring between the mother and offspring (known as joeys) up to the age of 20-36 months when the young disperse to find their own homes. Male Koalas communicate with loud bellows to intimidate rivals and attract females. They also mark their territory with secretions from a scent gland located on their chests.

Koalas usually live up to 10 years for males, and 12 years for females.

Creating a Koala Sanctuary

  • Unless they are connected to adjacent areas of habitat, Koala sanctuaries should be a minimum of 50 (ideally 100) hectares in size.
  • Connectivity through the use of wildlife corridors is essential, as Koalas generally will not move through more than 200m of open ground. Plantings should be more of a rounded or square shape rather than a long narrow strip, unless they are part of a wildlife corridor or are following a riparian zone along a watercourse.
  • Tree density should be 100 trees per hectare, at 10 m spacing.
  • Plant a range of different species to ensure there is always a wide assortment of food choices.
  • Koalas also use many species of Acacia, Casuarina, and Melaleucas for shelter on hot days.
  • Avoid barriers that will impede the movement of Koalas between areas of habitat, such as roads, fences, retaining walls, and buildings.
  • Ensure there is no threat from dogs – wild or domestic.

Koala Food Trees

Primary Food Source

Secondary/Supplementary Food Source

Botanical NameCommon Name
Eucalyptus agglomerataBlue-Leaved Stringybark
Eucalyptus amplifoliaCabbage Gum
Eucalyptus blakelyiBlakely's Red Gum
Eucalyptus bridgesianaApple Box
Eucalyptus cinereaArgyle Apple
Eucalyptus cypellocarpaMountain Grey Gum
Eucalyptus dealbataHill Redgum
Eucalyptus divesBroad Leaf Peppermint
Eucalyptus eugenoidesThin-leaved Stringybark
Eucalyptus globulus spp maideniiMaiden's Gum
Eucalyptus mannifera ssp manniferaRed Spotted Gum
Eucalyptus melliodoraYellow Box
Eucalyptus nicholiiWillow Peppermint
Eucalyptus obliquaMessmate
Eucalyptus ovataSwamp Gum
Eucalyptus parramattensisParramatta Red Gum
Eucalyptus paucifloraSnow Gum
Eucalyptus piperitaSydney Peppermint
Eucalyptus polyanthemosRed Box
Eucalyptus punctataGrey Gum
Eucalyptus quadrangulataWhite Topped Box
Eucalyptus radiataNarrow-leaved Peppermint
Eucalyptus rubidaCandlebark
Eucalyptus tereticornisForest Red Gum
Eucalyptus viminalisRibbon Gum

To find out more information on any of these species and our availability, please visit our online store.

If you would like further advice on designing your Koala sanctuary, we offer a consultation service.