Professional use squirrels traps. Powerful spring humane dispatch traps and strong live capture cage traps. Releasing grey squirrels in another squirrel’s territory is not humane, it may spread diseases and it is illegal. The Procull squirrel trap is an approved humane dispatch trap made in Britain. It has been designed with both the novice and professional trapper in mind who may be concerned about their ability to quickly and humanely dispatch these animals. The Kania 2000 has a very strong spring and is safe to set. Approved Fenn traps may also be considered. In areas where protected native species are present, a humane live catch cage trap must be used when alien grey squirrels need to be caught.