Eastern and southern Australia, including Tasmania.

Macropus giganteus, commonly known as the eastern grey kangaroo, typically inhabits areas with a range of environmental conditions. These include open forests, woodland, and pastoral land, exhibiting preference for moist, fertile regions with moderate to high rainfall. They are adaptable to varying climates, from temperate to subtropical environments.

This species is a herbivore, primarily grazing on grasses but also browsing shrubs. The eastern grey kangaroo plays a significant role in its ecosystem as a grazer, influencing the structure of vegetation and serving as prey for large predators, such as dingoes. Its ability to thrive in a wide range of open habitats makes it integral to the ecosystems it inhabits, impacting both plant and animal communities.