Description
It is 30-32 centimetres long with a wingspan of 51-57 centimetres and a weight of 73-156 grams. The adult male has a grey head, breast and upperparts. The belly is creamy-white with dark bars. The vent is frequently buff with few markings. The legs and feet are orange-yellow and there is a bare yellow ring around the eye. Adult females and juveniles occur in two morphs. The grey morph is similar to the male but has a brownish wash on the breast. The rufous morph is reddish-brown above, paler on the underparts and with strong dark barring all over including the rump.
The Common Cuckoo (C. canorus) is very similar in appearance but is slightly bulkier with longer wings and tail and a slightly smaller head and bill. It is slightly paler grey and the barring on the underparts is a little narrower. The vent is usually white with dark bars but is more similar to Oriental Cuckoo in a few individuals. Birds of the rufous morph have a plain rump with no dark bars unlike the Oriental Cuckoo.
The Himalayan Cuckoo (C. saturatus) is extremely similar to the Oriental Cuckoo but is slightly smaller and shorter-winged.
The call of the male Oriental Cuckoo is a series of low paired notes, "poo-poo", with both notes stressed equally. It is somewhat similar to the call of the Hoopoe. It may be introduced with a four to eight note phrase or sometimes with grating notes. The female's call is a deep bubbling trill. Outside the breeding season, the birds are usually silent. The call of the male Himalayan Cuckoo is a series of three or four note phrases with a short, high-pitched introductory note.
Read more about this topic: Oriental Cuckoo
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