Eastern Grass Owl

The Eastern Grass Owl, Tyto longimembris, also known as the Chinese Grass Owl or Australasian Grass Owl, is a medium-sized owl bearing a close resemblance to the familiar Barn Owl. Males typically range from 32 to 38 cm in length, while females, slightly larger, span from 35 to 42 cm. The wingspan of this species stretches from 100 to 116 cm. Males weigh approximately 400 grams, with females weighing 460 grams. Their plumage is characterized by dark brown or tan upper parts adorned with pale spots, and wings marked with black and tan bars. The beak is notably pale, and the legs are feathered. Their eyes are a deep brown, and they possess the distinctive heart-shaped facial disk edged with brown buff and a white border, a hallmark of the Tyto genus.

Identification Tips

When identifying the Eastern Grass Owl, look for the heart-shaped facial disk, a trait shared with other Tyto owls. The pale beak, feathered legs, and the specific pattern of spots and bars on the wings can help distinguish it from similar species.

Habitat

This owl has a preference for tall grasslands and swamps. It roosts in areas where the vegetation is flattened, creating a system of "tunnels" through which it can navigate.

Distribution

The Eastern Grass Owl is found across eastern, southern, and southeast Asia, parts of New Guinea, the Philippines, Australia (predominantly in Queensland), and the western Pacific.

Behaviour

The Eastern Grass Owl utilizes its long legs to penetrate dense ground cover and seize prey while hunting on the wing. Nesting occurs in similar habitats to those used for roosting, with nests often situated within the shelter of the grassland's "tunnels."

Song & Calls

The primary call of the Eastern Grass Owl is a loud, hissing screech. This vocalization is louder than that of a Barn Owl but quieter than that of a Masked Owl.

Diet and Feeding

The Eastern Grass Owl predominantly feeds on small rodents, with the long-haired rat and the cane rat being common prey in parts of Australia.

Conservation status

Globally, the Eastern Grass Owl is considered to be of "Least Concern" due to its wide distribution. However, within Australia, it is listed as vulnerable under the New South Wales Threatened Species Conservation Act of 1995.