I'm about to move into a new house with a couple of coconut trees, but I've noticed all the coconuts have holes in them. Are these holes caused by an insect or something, and if so, how do I stop it happening?

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They look like they were attacked by rodents but the photos are hard for me to see. 

 

some parts of the world have coconut eating rats...maybe do a google search on agricultual pests for thailand ?

 

 

My misses says the same could well be rats ,they do like  coconuts.

 

To prevent them ,some baffle   plates around the trees   should stop them  climbing up the trees .

Thanks for the replies ClutchClark and kickstart, much appreciated. I did some searching on Google and youtube, but nothing i found is similar to the holes made in my coconuts. There's a black headed caterpillar that ruins coconuts, and a rhinoceros beetle but neither looks like the cause. I'm hoping it's a rodent and will try tying plates around the trees as suggested. The coconut trees are really small, so a rat could easily climb up. Funny thing is there's also a mango tree but that hasn't been touched, it's about twice the height of the coconut trees so maybe rats can't climb it. 

Squirrels?

Probably coconut rats.  There is a humungus crab that lives in some coconut areas.  Don't know if they cause this.