Pacific Koel vs Black-eared Cuckoo

To differentiate the Pacific Koel from the Black-eared Cuckoo, focus on the bill color and plumage patterns. The Pacific Koel may have a blackish or pale horn bill, while the Black-eared Cuckoo has a more consistent plumage pattern without the variable spotting seen in the Pacific Koel.

Bill color: Pacific Koel's bill can vary from blackish to pale horn, whereas Black-eared Cuckoo's bill is not specified to vary similarly. Plumage: Look for the Pacific Koel's dark brown upperparts with buff spots and paler underparts with fine blackish barrings, which are not present in the Black-eared Cuckoo.

Pacific Koel's plumage varies with populations, showing dark brown upperparts with buff spots and paler underparts with fine blackish barrings. In contrast, the Black-eared Cuckoo has a more uniform plumage without such variable spotting.