Tui De Roy / Waved albatross (Phoebastria irrorata) pair in courtship display, Galapagos, Ecuador. Critically Endangered species.

Tui De Roy / Great frigatebird (Fregata minor) male displaying inflated gular sac, Galapagos, Ecuador.

Eric Baccega / Polar bear cub 3 months (Ursus maritimus) playing in the front of the day den in march. Wapusk National Park. Churchill, Manitoba, Canada

Shattil & Rozinski,Shattil & Rozinski / Red fox (Vulpes vulpes) playing with a dead squirrel in a garden Denver, Colorado, USA, July.

Tim Laman / Satin Bowerbird (Ptilonorhynchus violaceus minor) male displays to a female who has entered his bower. This bower is decorated with all natural objects. Rainforest of the Atherton Tablelands, Queensl...

Erlend Haarberg / Great snipe (Gallinago media) displaying, Norway, June.

Erlend Haarberg / Great snipe (Gallinago media) displaying, Norway, June.

Erlend Haarberg / Great snipes (Gallinago media) displaying, Norway, June.

Thomas Lazar / Common loon (Gavia immer) pair swimming with fledgling. One adult crouched with head and neck parallel to water in territory/alarm display. Turtle Flambeau Scenic Waters Area, Wisconsin, June.

Roland Seitre / Brush-tailed Bettong (Bettongia penicillata) pair playing, Australia. Critically endangered species.

Erlend Haarberg / Great snipe (Gallinago media) displaying. Norway, May.

Erlend Haarberg / Black grouse (Tetrao tetrix) male displaying. Flatanger, Norway, April.