The Longworth trap is has been widely used in the UK for many years. It is our most popular small mammal trap, designed to minimise the discomfort of the animal. It is constrcted from anti-corrosion aluminium which makes it lightweight for field use and it is designed to allow easy access to all parts for cleaning.
The trap consists of two parts: a tunnel which contains the door tripping mechanism and a nest box, which is attached to the back of the tunnel. The sensitivity of the tripping mechanism is adjustable and the nest box provides a large space for food and bedding material to ensure that the trapped animal is comfortable until release. When in use please ensure the nest box is at an upwards angle to the trap tunnel to prevent rain entering the nest box and to provide drainage of urine or condensation. When the trap is not in use the tunnel can be conveniently placed inside the nest box for easy carriage or storage. A Longworth trap without a shrew hole is available for use in areas where shrew trapping is unlikely.
NB: Some small mammal species are protected by law (e.g. shrews in the UK) and you must obtain a licence from Natural England, Scottish Natural Heritage or the Natural Resources Wales if you set traps with the intention of trapping any species of shrew. Please ensure you are aware of and meet the requirements of any relevant laws in the country in which you are trapping.
For more information on small mammal surveying see the NHBS Guide to Small Mammal Survey equipment.
Longworth Small Mammal Trap Instructions
Weight: 300 g
Construction: Corrosion-resistant aluminium
Size of nest chamber: 14 cm x 6.5 cm x 8.5 cm
Total length when set: approx 25 cm
Diameter of shrew hole: 12.5 mm