The name is taken from the site of the first such trap, the Heligoland Bird Observatory on the island of Heligoland, Germany, where it was developed by Hugo Weigold who established the observatory and initiated the banding program there.
F. (n.) elisae, increasingly separated as Chinese Flycatcher or Green-backed Flycatcher (Ficedula elisae, Weigold, 1922), breeding endemic to northeast China, wintering south to Vietnam and Malaysia, breeding males lack a bold supercilium, have an olive-green crown, and mantle instead of black, and lemon-yellow underparts
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