Birds
File:Hierococcyx bocki.jpg

Dark Hawk-Cuckoo

Dark Hawk-Cuckoo

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Once considered a subspecies of the Large Hawk-cuckoo, the Dark Hawk-cuckoo is now recognized as a distinct species primarily found on Borneo and Sumatra. It is characterized by its generally darker plumage and specific vocalizations.
Where to spot
Endemic to the islands of Borneo and Sumatra in Southeast Asia, favoring montane forests and submontane evergreen forests.
How to spot
Distinguish from other hawk-cuckoos by its darker overall plumage and unique call patterns within its specific island habitat. Listening carefully to its vocalizations is often the most reliable method of identification.
When to spot
Resident within its island range, vocalizing most actively during the breeding periods, which can vary locally.
File:Hierococcyx bocki.jpg
File:Hierococcyx bocki (cropped).jpg
File:Hierococcyx bocki.jpg
Credits: Wikimedia Commons
File:Hierococcyx bocki (cropped).jpg
Credits: Wikimedia Commons
The recognition of the Dark Hawk-cuckoo as a separate species, often based on subtle morphological and vocal differences, highlights the complexity of avian taxonomy and ongoing discoveries through bioacoustic and genetic research.
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