Aflo / ic-02802 Two domestic cats sleeping with heads close together {Felis catus}

Aflo / ic-02801 View of heads of two domestic cats sleeping close together {Felis catus}

Sandra Bartocha / Red-flowered Cowslip (Primula veris), Potsdam, Brandenburg, Germany

Anup Shah / Common zebras greeting {Equus quagga} Masai Mara GR, Kenya East Africa

Doug Perrine / Atlantic spotted dolphins touching {Stenella frontalis} Bahamas, Caribbean Sea (Non-ex).

TJ Rich / Two Lioness {Panthera leo} Masai Mara, Kenya, Africa

Eladio Fernandez / Humpback whale (Megaptera novaeanglae) turns on its back to 'fin slap' a behavior thought to request companionship from another whale. Hispaniola, Dominican Republic.

Laurent Geslin / Mute swan (Cygnus olor) pair courting. Walthamstow reservoir, London, UK

Nick Upton / Boy running with pet dog (Canis familiaris) a 'goldendoodle' golden retriever / standard Poodle cross. Hampshire, UK, October. Model released.

Nuno Sa / Whale Shark (Rhincodon typus) accompanied by Pilot Fish (Naucrates ductor). The biggest fish in the world has only started to visit the Azores in the past three years due to water temperature rise. Sa...

Bryan and Cherry Alexander / Nenets men playing cards in the evening at a reindeer herder's camp, Tambey, Yamal Peninsula, Western Siberia, Russia, March 2011

Jouan & Rius / White Stork (Ciconia ciconia) pair perched in tree, Alsace, Upper Rhine, France, May