Square-tailed Drongo-cuckoo, a medium sized black bird with a long black tail with a very shallow fork, darker below, glossy above, with white barring on undertail and a narrow, decurved black bill. Perched on a bare branch in trees. Drongo-cuckoos are members of the cuckoo family that strongly mimic black species of Drongo (which are in the corvid family). Key differences are the cuckoo-like thin, decurved bill and the white-tipped undertail coverts. Drongo-cuckoos are brood parasites of babbler species and it's unclear exactly how mimicking drongos benefits them.
Square-tailed Drongo-cuckoo, a medium sized black bird, with a long black tail with a very shallow fork, perched on a branch in trees.
#BirdOfTheDay theme is #BlackHeads, any bird with Black on its head, like this Square-tailed Drongo-cuckoo I found in Benchakitti Park #Bangkok a week ago. See alt text for more on Drongo-cuckoos. #cuckoos #mimicry #migrantbirds
#Thailand #birds #birding #EastCoastKin #urbanBirding #birdsSeenIn2026