Original air date: 2 April 2023
A graphical timeline of the episode is below

Below is a relatively detailed look at a timeline of the episode

In grey are the main parts of the episode, including the various stages of a river’s development

Sometimes dragonflies are easy meals, but not always

Dragonflies can actually take evasive action (the above sequence is from 2’04-2’06 in the episode)
To film salmon leaping through the waterfalls it took ingenuity to think of a new way to film something that had been film countless times before.

No need to explain what is going on. This is a different view of the leaping from what we usually see.

Filming the salmon leaping took something very special (51’46), as did filming them in the river.