Image above ... Stoat trap. Traplines are place in many parts of New Zealand to help control populations of invasive mammals, such as stoats (a weasel-like critter). The trap is baited with a chicken egg and when a stoat enters, a snap trap breaks its neck. This trap can kill two stoats, one on each end, before it needs reset. This helps protect birds and other species of conservation concern. I wonder what you think about this.
Union of Concerned Scientist ESA Toolkit for Scientists ...
https://www.ucsusa.org/sites/default/files/attach/2017/07/esa-toolkit-ucs-july-2017.pdf