411 REFERENCE · Wiktionary
Heligoland trap
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
The first such trap was located at a bird observatory on the island of Heligoland, Germany.
Noun
A large, building-sized, funnel-shaped, rigid structure of wire mesh or netting used to catch birds for ornithological study.