Greater Coucal vs Asian Koel

In short

The Greater Coucal and Asian Koel are both large, dark cuckoos, but they can be distinguished by their structure and vocalizations. The Greater Coucal has a more robust body with a longer tail and a distinctive deep, resonant call, while the Asian Koel is slimmer with a pale bill and a more melodious song.

Identification tips

1. Tail Length: Greater Coucal has a longer tail. 2. Bill Color: Asian Koel has a pale bill. 3. Vocalizations: Listen for the deep call of the Greater Coucal versus the melodious song of the Asian Koel. 4. Plumage: Look for chestnut wings in Greater Coucal and spotted females in Asian Koel.

Size

The Greater Coucal is generally bulkier with a longer tail compared to the slimmer Asian Koel.

Plumage

Greater Coucals have a glossy black head and body with chestnut wings, whereas Asian Koels are mostly glossy black in males and brown with white spots in females.

Behaviour

Greater Coucals are often seen walking on the ground or in low vegetation, while Asian Koels are more arboreal and often seen in trees.

Habitat

Both species inhabit similar environments such as forests, gardens, and agricultural areas, but Greater Coucals are more often found in dense undergrowth.

Voice

The Greater Coucal has a deep, booming call, while the Asian Koel produces a repetitive, melodious 'ko-el' sound.