Snares have been used for thousands of years to trap animals. A fairly simple but inherently cruel design, snares are essentially a loop set along a trail or suspended from a branch or small tree which catches an animal by the neck or leg as they walk into it. As the animal continues to move forward or struggles to get free, the loop pulls tight. If the snare is strong enough (so doesn’t snap) or can’t be dragged away, the animal will suffocate, their neck will dislocate, or they will be held where they were caught and then beaten to death or shot. Snares used on eg shooting estates are made from thin steel wire. They’re cheap to make, easy to use, light to carry, quickly replaced, and far quieter than a rifle (so won’t alert police, or forest or park rangers, when committing wildlife crime). They are basically a low-cost, low-skilled way to kill (or maim/injure) wildlife.