Remi Masson / European beaver (Castor fiber) eating branches in the water before approaching the camera, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Group of Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.

Remi Masson / Group of Black bullhead (Ameiurus melas) shoaling to protect themselves against predators, River Rhone, Rhone-Alpes, France, July.

Remi Masson / Tracking shot of a Eurasian beaver (Castor fiber) swimming underwater, turns to look at camera, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Eurasian beaver (Castor fiber) carrying branches back to lodge, dropping them when alarmed. River Rhone, Rhone-Alpes, France, June.

Remi Masson / Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June.

Remi Masson / Group of Nase (Chondrostoma nasus) and Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.

Remi Masson / Shoal of Nase (Chondrostoma nasus) spawning, River Ain, Rhone-Alpes, France, April.

Remi Masson / Group of Wels catfish (Silurus glanis) gathered in the River Rhone, France, August.

Remi Masson / European beaver (Castor fiber) swimming underwater and urinating, River Rhone, Rhone-Alpes, France, June.

Bence Mate / Great flamingo (Phoenicopterus roseus) group in flight, Pont De Gau Park, Rhone River, France.

Bence Mate / Great flamingo (Phoenicopterus roseus) feeding in sludge at bottom of river, Pont De Gau Park, Rhone River, France.