Staffan Widstrand / Wild Wonders of China / Tibetan wolf (Canis lupus) in snow, Keke Xili, Changtang, Tibetan Plateau, Qinghai, China

Eric Baccega / Pack of Grey wolves (Canis lupus) howling in the snow, captive. Bavarian Forest National Park, Germany, March. Captive.

Eric Baccega / Pack of Grey wolves (Canis lupus) greeting one another and expressing submissive behaviour,captive, Bavarian Forest National Park, Germany, July. Captive.

MYN / Corne van der Linden / Wolf spider (Venator immansueta) Perth, South-Western Australia.

Andy Rouse / Grey wolf (Canis lupus lupus) Finland, September.

Juergen Freund / Dingo (Canis lupus dingo) at Devils Marbles, Northern Territory, Australia.

Roland Seitre / Arabian wolf (Canis lupus arabs) running. Captive, occurs in Israel, Iraq, Oman, Yemen, Jordan and Saudi Arabia.

Roland Seitre / Arabian wolf (Canis lupus arabs) running over sand. Captive, occurs in Israel, Iraq, Oman, Yemen, Jordan and Saudi Arabia.

Edwin Giesbers / Wide angle close-up of a European grey wolf (Canis lupus) in landscape, captive, Norway, February.

Edwin Giesbers / Wide angle close-up of two European grey wolves (Canis lupus), captive, Norway, February.

Edwin Giesbers / Close-up portrait of a European grey wolf (Canis lupus), captive, Norway, February.

Edwin Giesbers / Wide angle close-up of two European grey wolves (Canis lupus), captive, Norway, February.