Well they are not aware of the pandemic but those catering for the monkeys have fled.  The monkeys are let loose from the site.  Frankly, a lot of animals in Thailand zoos are only served to entertain visitors, and their living conditions are often jeopardized.

By the way, there is a channel on YouTube that provides live-cams around Thailand.  Here it goes.  A way to explore without real life engagement.

https://www.youtube.com/channel/UCmYyJaUxYiF5IbLx-0jFXHQ