The present invention provides for pest detection apparatus which signals the detection of a pest and subsequently retains the pest for the purpose of inspection and which includes an entrapment portion (42) accessible via an entrance portion (34) such that detection means detects the presence of a pest in the region of the entrapment portion (42) and which apparatus is likely to be most effective in capturing small animals of the phylum Arthropoda but may similarly be used with other small pests such as rodents.