I see them all over the place, but generally they seem to be about halfway up every mountainous area that isn't the snow island. I also see one on the smaller North island that's heavily forested.

North Spawn

Also far east side edge of the map. 60 x 86ish

You can find them pretty much everywhere also you can find them in the middle of the jungle, there are a few spawns at the mountain at 44 / 25, 13 / 50