Larsen trap

A Larsen trap is a device used to live trap wildbirds. It is used in avian predator control programs, and in scientific research. It is essentially a cage with two (or more) compartments. A previously caught magpie or crow is kept in the decoy compartment, and this attracts territory holders who see the decoy as an intruder. ==Use in the United Ki...
Found on http://en.wikipedia.org/wiki/Larsen_trap
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