Skip to main content

Go back to blog

World Wildlife Day 2022

  • Thursday 3rd March 2022
  • Conservation, Environment, Cassowary, Bilby, Tasmanian Devil

Dharra The Tasmanian Devil 1

On March 3rd 2022, World Wildlife Day will be celebrated under the theme: “Safeguarding key species for ecosystem restoration”. In honour of this year's World Wildlife Day theme, we have chosen to honour our keystone species: The Cassowary, the Bilby and the Tasmanian Devil. 

What is a keystone species?

Keystone species refers to any animal or plant that is essential to the sustainability, function and growth of an ecosystem. Whilst 'keystone species' is not the official term used by scientists, by calling a particular animal or plant in an ecosystem a keystone species, it emphasises to the public just how vital that species is to the survival of others and to the ecosystem itself.

Our WILD LIFE Sydney Zoo Keystone species

The Southern Cassowary aka. The Rainforest Gardener

Easily mistaken for a left-behind dinosaur, the Southern Cassowary is the largest bird in the Australian rainforests. Armed with a sharp claw on their inner toe it is easy to see how they’ve earned the title of world’s deadliest bird. But don’t be fooled, the Cassowary is so much more than the world’s deadliest bird. 

The Cassowary is considered a keystone species as they play an important role in maintaining the biodiversity of the rainforests ecological system. The rainforests depend on the Cassowary for seed dispersal and germination as the Cassowary is the world’s ONLY long-distance seed dispersal unit; they are essential to the survival of many other rainforest species. 

Cassowaries have the unique ability to swallow fruits whole, digesting only the pulp and then passing the seeds along entirely unharmed into large piles of dung ALL over the rainforest! Many other animals in the Australian rainforests depend on these fruits and plants and therefore depend on the cassowary for survival. 

The Cassowary has been known to eat and aid in the dispersal of over 200 different species of plants!

IMG 4210

The Bilby aka. The Soil Engineer

A nocturnal marsupial with big ears and a small body? Ring any bells? How about the “Easter Bilby”? Now it’s starting to sound familiar! The Bilby's claim to fame might be Easter, but it’s not the bilby’s most important job: they are also soil engineers. 

This small and mighty marsupial can dig through 1.5 tonnes of soil in a lifetime!

The Bilby is considered a keystone species as it plays a crucial role in the balance of the Australian ecosystem. Using its front paws, the Bilby digs deep down into the soil and as it does this, plant material falls into the holes and can decompose. This aids in soil restoration and vegetation rejuvenation. 


The Tasmanian Devil aka. The Scavenger

The Tasmanian Devil is native to Tasmania and plays the part of both scavenger and predator within the Tasmanian ecosystem. They are actually at the top of their food chain! Early European settlers were mystified by the unusual screams and growls this animal made, and so they named them “the devil”.

The Tasmanian Devil is considered a keystone species due to the vital role it plays in maintaining the balance of the Tasmanian ecosystem. Being the largest native predator in Tasmania, the Tasmanian Devil is thought to keep other introduced predators numbers down. And by moonlighting as a scavenger, they eat left over scraps of meat which in turn leads to a decrease in blow fly numbers. 

Dharra The Tasmanian Devil 9

On December 20th 2013 during the United Nations General Assembly (UNGA), it was declared that moving forward March 3rd will be known as World Wildlife Day #WWD. The sole purpose of this designated day is to celebrate and raise awareness of the world’s wild animals and plants. 


To find out more about our keystone species and our conservation projects click here. 

Find out more

Download the official World Wildlife Day colouring page

Download the official World Wildlife Day poster