Here are two simple ways to say the same jungle paragraph for a 7-year-old:
In the tall, wet trees of the Amazon, bright parrots sit and squawk. Down below in the rivers, crocodiles and sharp-toothed piranhas wait. In the Asian jungle you can spot a peacock spreading its shiny tail, a scaly pangolin, and a striped tiger.
The Amazon's treetops are thick and dripping with rain, full of colorful parrots. In the rivers beneath, crocodiles and piranhas hide. In jungles in Asia you might see a peacock show off its sparkly tail, a scaly pangolin, and a tiger with bold stripes.