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An epic journey following Wales’s rivers from their birth in the mountains to the sea, discovering the hidden secrets of wildlife along the way as cutting-edge camera technology captures animals like never before.

Super slow-motion cameras film peregrine falcons on the hunt and reveal why their prey, the unsuspecting red grouse, are often able to evade the fastest predator on earth. Dragonflies’ amazing aerial acrobatics are slowed down 400 times their normal speed and red squirrels are captured as they leap through the trees.

In a city park, pigeons' hidden superpowers are laid
bare, and in an upland garden, a subtle hierarchy is at play as birds gather around a feeder. The latest underwater cameras take us below the waves off the Welsh coast as catsharks mate and lay their eggs, while in the headwaters of the River Wye a complex and surprising microworld is revealed.