On my walk today, I noticed many caged monkeys around Monkey Hill in Songkhla. Does anyone know why they are trapping them? I hope it's for vasectomy rather than castration.

I can't answer your question however I used to walk monkey hill in Songkhla most evenings in 2000, 2001 when dating my former wife. Always a pleasant walk, as the monkeys, or rather, long tailed macaques, were not too vicious those days. Used to watch them jumping from the trees into the pond at the top of the hill.

 

One of two monkeys that ever annoyed me was in Songkhla

Last time they had crack down (2020) on begging and aggressive monkeys at Khao Tang Kuan in Songkhla it was castration, some 200 faced the chop. Surprised they're trapping them again so soon, but would suspect they face a similar fate.

 

https://thethaiger.com/news/south/monkeys-castrated-after-causing-chaos-in-songkhla

Yesterday I saw them loading a female from the trap to cage on truck. 

24 minutes ago, whaleboneman said:

Yesterday I saw them loading a female from the trap to cage on truck. 

 

If they're rounding up the females this time then castrating the males didn't do the job, so time to sterilize the females, which is what they probably should have done first time around.