This is a trap I use for catching large amounts of English sparrows. They transmit diseases to your flock as well as lice and other kinds of little creepy crawler.
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Popping heads off is easy. Some use scissors.So... what do you do once you catch them? Invasive or not, they deserve a humane death, and I don't see any way to get them out without them all escaping. Seems like chopping off all their tiny heads might be a bit difficult, too.