Effect of neutering on two groups of feral cats.

Two colonies of urban feral cats were subjected to a programme of population control by trapping, neutering and returning to site. The behaviour of individual cats and the stability of the groups was studied before and after the programme, which was then assessed in terms of its humaneness and effectiveness as a means of control. The method was satisfactory on both counts and may be recommended for controlling feral cat colonies where the welfare of the cats can be assured after their return.