Rolf Nussbaumer / Dung Beetle (Scarabaeinae) adult rolling dung ball. Laredo, Webb County, South Texas, USA Not available for ringtone/wallpaper use.

Theo Bosboom / Powerful waves rolling in at the Atlantic coast of Iceland near Dyrholey during a powerful winter storm. February 2016

Lucas Bustamante / Sri Lankan leopard (Panthera pardus kotiya) rolling on its back, Yala National Park, Sri Lanka

Espen Bergersen / Aerial shot of a Humpback whale (Megaptera novaeangliae) swimming showing belly, Troms, Norway, January.

Espen Bergersen / Aerial shot of a Humpback whale (Megaptera novaeangliae) showing belly and blowing, Troms, Norway, January.

Claudio Contreras / Caribbean Flamingo (Phoenicopterus ruber) rolling egg to side in the nest, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, June, June, Finalist in the Portfolio Category of the Terre Sauvag...

Jim Manthorpe / Close-up of a Common otter (Lutra lutra) grooming and rolling in seaweed, Western Scotland. March.

Brian Bevan / Grey seal (Halichoerus grypus) pup trying to suckle, Norfolk, England, UK, January.

Dave Watts / Female Western grey kangaroo (Macropus fuliginosus) rolling with a large joey in her pouch, Kangaroo Island, South Australia.

Dave Watts / Female Australian sea lion (Neophoca cinerea) scratching and rolling on a beach, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Roy Mangersnes / Juvenile female Polar bear (Ursus maritimus) rolling, playing with ice in a fjord, Svalbard, Norway, March.

Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) playing, rolling down a slope, part of the Amahoro Gorilla Group, Volcanoes National Park, Rwanda.