出典:Wikipedia
出典:『Wikipedia』 (2011/05/22 20:59 UTC 版)
A pitfall trap is a trapping pit for small animals, such as insects, amphibians and reptiles. Pitfall traps are mainly used for ecology studies and ecologic pest control. Animals that enter a pitfall trap are unable to escape, and may either be killed by the trap or remain unharmed. This is a form of passive collection, as opposed to active collection where the collector catches each animal (by hand or with a device like a butterfly net). Active collection may be difficult or time consuming, especially in habitats where it is hard to see the animals such as thick grass or leaf litter.