The start of the monkey sterilisation process began on June 12 after public meetings agreed that the island’s monkeys, in the public “hot" zones, needed to be sterilised and re-homed in a systematic programme.
Stage one to capture, sterilise and release some of the excess monkey population around Phuket was seen as a great success.
Yesterday (September 13) a team of officers from the Natural and Wildlife Education Centre at Khao Phra Thaew reserve in Thalang took 129 southern long-tailed macaques, which had been captured at Khao To Sae, to the reserve for sterilisation before releasing them back into the wild.
Source: https://thethaiger.com/news/phuket/129-phuket-monkeys-caught-for-sterilisation