Common Hawk-Cuckoo Hierococcyx varius varius occurs in southeast Tibet to 1200 m (3,940 ft.). HABITAT & BEHAVIOR Arboreal, secretive, and insectivorous; parasitizes nests of babblers. ID & COMPARISON Closely mimics Shikra not only in plumage but also style of flight. Smaller than Large Hawk-Cuckoo H. sparverioides, with paler slaty-grey upperparts. Rufous on breast and flanks paler and more extensive than Large Hawk-Cuckoo. Chin lighter than Large Hawk-Cuckoo, and underparts cleaner, with fewer, mostly rufous markings. Black bands of mainly grey tail narrower than Large Hawk-Cuckoo. Juvenile spotted on breast and flanks (flanks having more barring in juvenile Large Hawk-Cuckoo). BARE PARTS Bill greenish-grey (yellow in juveniles); feet, iris, and eye-ring yellow. VOICE Well-known “brain fever” song, shriller than Large Hawk-Cuckoo, given throughout day and even at night (especially moonlit nights), a repeated phrase of three notes, accent on second, the phrase gradually rising in pitch then abruptly ending. — Craig Brelsford
RESOURCES ON CUCKOOS
The Cuckoos of Shanghai: Craig Brelsford examines the Shanghai-area parasitic cuckoos and teaches you how to tell them apart. The non-Cuculus parasitic cuckoo that one is most likely to see in Shanghai is Large Hawk-Cuckoo. Rufous Hawk-Cuckoo, Asian Koel, and Chestnut-winged Cuckoo also are occasionally noted.
Indian Cuckoo & Common Cuckoo: A Comparison: Note the smaller size of Indian Cuckoo, its thicker barring, and its darker iris. Voice as always is the surest differentiator. Both Indian Cuckoo and Common Cuckoo occur on passage in Shanghai and breed in the region.
Why This Cuckoo Is Lesser Cuckoo: The Cuculus I saw at Shanghai’s Cape Nanhui in September had the dark eye, well-defined and widely spaced barring, and small size suggestive of Lesser Cuckoo. See my photos of the thrush-sized cuckoo.
My Exchange with a Reader About Cuculus Cuckoos: “Draw a circle around the five [Cuculus] cuckoos [of China],” Craig Brelsford instructs a shanghaibirding.com reader. “Within that circle, draw three circles: one around Indian, one around Lesser, and one around Common, Himalayan, and Oriental.” Using this method, one quickly clusters the three main groups of Cuculus in China.