Australian Boobook

01 · Identification

How to tell it apart

The Australian Boobook is the smallest and most widespread owl on the Australian mainland, measuring 30 to 35 centimetres. This compact bird features a rounded head without ear tufts and predominantly dark chocolate-brown plumage, heavily marked with white or buff spots on the wings and shoulders. The underparts are distinctively streaked and mottled, while the inconspicuous facial disc is highlighted by pale, prominent “eyebrows” and dark patches around eyes that range from greenish-yellow to grey-green. Regional variation is significant: birds in arid inland areas appear pale and sandier, while those in the humid north are smaller and darker with a reddish-brown tint. The most reliable identification feature is its iconic, rhythmic “book-book” or “mo-poke” call, a two-tone whistle with the second note lower in pitch. Other vocalisations include a rapid, vibrating “por-por-por” and a high-pitched screech. Mainly nocturnal and crepuscular, it roosts by day in dense foliage or tree hollows, often huddling close to a trunk to mimic a broken branch. An opportunistic hunter, it pounces from open perches onto large insects, small mammals, or birds with silent, moth-like wingbeats. Extremely adaptable, it inhabits almost every environment with trees, from rainforests and arid mulga to leafy suburban gardens; however, it is absent from Tasmania. It is most often confused with the larger Barking Owl, which features piercing yellow eyes, vertical breast streaks, and a dog-like “wuff-wuff” call. The much larger Powerful Owl is distinguished by distinct V-shaped chevrons on its underparts.

Description · BirdUp · CC BY-SA 4.0

1. 01

   Large, greenish-yellow eyes

   Brightly colored and appear prominent on the face, a key identifier.

2. 02

   Prominent pale spots on brown upperparts

   Numerous off-white to buff spots create a heavily mottled appearance on the dark brown back, wings, and head.

3. 03

   Coarsely streaked breast and belly

   Underparts are whitish or buff with broad, messy brown vertical streaks and mottling.

4. 04

   Rounded head, no ear tufts

   The head has a smooth, round silhouette, lacking the prominent feather tufts seen on some other owl species.