Australasian Bittern vs Black-backed Bittern

In short

Australasian Bittern and Black-backed Bittern are both members of the Ardeidae family, but they differ significantly in size and plumage. The Australasian Bittern is much larger and has a more cryptic, streaked appearance, whereas the Black-backed Bittern is smaller with distinctive black upperparts.

Identification tips

1. Size: Look for the larger size of the Australasian Bittern. 2. Plumage: Note the black upperparts of the Black-backed Bittern versus the streaked appearance of the Australasian Bittern. 3. Habitat: Consider the habitat; Australasian Bitterns are more likely in large reed beds, while Black-backed Bitterns may be in mangroves. 4. Vocalization: Listen for the deep boom of the Australasian Bittern compared to the softer call of the Black-backed Bittern.

Size

The Australasian Bittern is significantly larger, about twice the size of the Black-backed Bittern.

Plumage

Australasian Bittern has a heavily streaked brown and buff plumage, providing excellent camouflage in reeds. In contrast, the Black-backed Bittern features a striking black back and wings with a paler underbody.

Behaviour

Both species are secretive and often remain hidden in dense vegetation, but the larger Australasian Bittern is more likely to be seen in open areas when flushed.

Habitat

Australasian Bitterns are typically found in large freshwater wetlands with dense reed beds, while Black-backed Bitterns prefer smaller, more secluded wetlands and are often found in mangroves.

Voice

Australasian Bitterns are known for their deep, booming calls, especially during the breeding season. Black-backed Bitterns have a softer, less resonant call.