About 300 m long, the island that is largely a mass of weathered granite boulders, with a cove and beach on the northern side providing a landing for small boats. There is little vegetation, though pockets of soil on the higher part of the island support a few plants including the native common boobialla and introducedAfrican boxthorn, tree mallow and buckthorn. Seabirds breeding on the island include little penguins and silver gulls. There is also a large roost of feral pigeons.[2]
Little penguin colony
The 2013 Encounter Bay penguin census conducted by penguin ecologist Dr. Diane Colombelli-Négrel from Flinders University found no penguins and no active burrows on Pullen Island. The census' report concluded that the colony had not recovered from a prior collapse.[3]
Protected area status
Pullen Island has enjoyed protected area status since 2 September 1948 when it was declared as a closed area for birds under the Animals and Birds Protection Act 1919-1946.[2] On 16 March 1967, the island gained status as a Fauna Conservation Reserve.[4] In 1972, the reserve was re-dedicated as the Pullen Island Conservation Park following the enactment of the National Parks and Wildlife Act 1972.[2]