Have you ever been in a jungle? Or even a really thick forest?
Just imagine, it's hot and humid...you feel sticky all over. The river is narrow and the light is getting low with the evening approaching.
You see spiders (and these are not your normal spiders) everywhere

And eyes of reptiles peering at you from the water

it's just you and the other people in your boat..there are no other boats around
and you hear this
I was very happy that I was not alone in my canoe 🙂
The sounds came from Howler monkeys. They can be heard from over a mile away. Eerie...but also very cool!