Before putting out your trap, be aware that great crested newts are a protected species so you must not use these traps if you know or suspect they are present. Only ecologists with a survey licence can use bottle trapping, or any other methods, to interfere with, catch or pick up great crested newts.
As this type of bottle trap is completely submerged, you must check the trap every few minutes to ensure no wildlife has become stuck in the neck. Do not leave the trap unattended as water-breathing insects, newts and other species may drown.
All illustrations by Alan Batley