Magpie robins often incorporate mimicry into their songs, and copy various species.
Chestnut bulbul seems to be a favourite for some reason, for both magpie robins and long-tailed shrikes (which also often mimic). Perhaps they like to mimic these because the call is so distinctive and easy to copy.
Black-throated Laughingthrush is also a regular mimic, and they seem to be very fond of Crested Serpent Eagle.
I even heard a Hainan Blue Flycatcher including mimicry in its song last week!
