Fan-tailed Cuckoo
Cacomantis flabelliformis
The fan-tailed cuckoo is about 25–27 cm (9.8–10.6 in) long. The fan-tailed cuckoo has a slate-grey head, back and wings, rufous underparts and barred black and white tail. Its eye is surrounded by a yellow orbital eye ring which helps to distinguish it from the smaller and paler brush cuckoo (C. variolosus) and the also smaller chestnut-breasted cuckoo (C. castaneiventris).
ID text from Wikipedia, CC BY-SA 4.0

Sahul Brush Cuckoo
Cacomantis variolosus
The Sahul brush cuckoo is about 22–26 cm (8.7–10.2 in) long. The plumage of adult males and females is similar. The head is pale grey, the breast is buff, the back is grey-brown, and the underside of the tail is brown with white tips and bars. The eye has a narrow, pale ring around it, and the feet are olive-pink. Juvenile plumage is heavily barred dark brown. The wings are sharply pointed and backswept in flight. Underwings are grey-brown with pale buff underwing coverts and a white or pale buff bar.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Fan-tailed Cuckoo and Sahul Brush Cuckoo.