Original air date: 20 November 2016
The timeline below shows what happens in the episode

Selected material
One killer hunting another

A male jaguar hunting a caiman (one killer killing another one)
Jungles make their own weather

Water vapour streaming up (above) until they condense into raindrops that fall back down and drench the leaves of the trees underneath

The animals have to endure the downpours

The downpours are harder on the tiny insects more than most
Final words: “This crowded world is so full of invention that almost all kinds of animals on land can trace their origins back here… including us.”