Successful Control of Feral Cat Populations Through Trap-Neuterreturn and Long-term Monitoring on a Remote Island in Hong Kong: A Community Case Study

Abstract

Cat colonies are common in SE Asia and are a result of irresponsible pet ownership, high abandonment rates, and a lack of legislation limiting pet shop breeding. The Society for the Prevention of Cruelty to Animals (SPCA) in Hong Kong Special Administrative Region controls feral cat populations by providing trap-neuter-return (TNR) services, under the Cat Colony Care Program (CCCP). During CCCP programs cats are caught, assessed on behavioural/health grounds, and (1) neutered and returned to the colony location, (2) placed in rehoming programs for public adoption, or (3) euthanized. In this longitudinal study we present representative desexing and observational survey results for a feral cat population on a remote island in Hong Kong Special Administrative Region that was subject to action under the CCCP. Results from desexing data and surveys show initial high cat numbers, close to public restaurants and walkways (n > 100). However, as the program progresses, a decrease in cat abundance is documented until only a single individual was sighted between 2019 and 2023. This case study is an example of a successful population control program for island cats in Asia, and highlights the fact that TNR programs coupled with consistent, long-term monitoring, public awareness programs, and cat removal for re-homing can reduce feral animal numbers.