Richard Du Toit / Aerial view of herd of Dromedary camels (Camelus dromedarius) with long shadows, northern Kenya

Angelo Gandolfi / Cattle egret (Bubulcus ibis) on back of Dromedary camel (Camelus dromedarius), Morocco.

Angelo Gandolfi / Cattle egret (Bubulcus ibis) on back of Dromedary camel (Camelus dromedarius), Morocco.

Angelo Gandolfi / Dromedary camel (Camelus dromedarius) train crossing Merzouga dunes, Tafilalt, Sahara, Morocco, March 2007.

Angelo Gandolfi / Cattle egret (Bubulcus ibis) on head of Dromedary camel (Camelus dromedarius), Morocco.

Michael Hutchinson / Llama (Lama glama), Los Glaciares National Park, Argentina

Hanne & Jens Eriksen / Dromedary camels (Camelus dromedarius) amongst sand dunes. Liwa, United Arab Emirates.

HUW CORDEY / Domesticated Bactrian camels (Camelus bactrianus) walking across Gobi Desert, Mongolia, January 2004. From BBC Planet Earth Series.

Hermann Brehm / Guanaco resting with baby {Lama guanicoe} Torres del Paine NP, Chile

Pete Oxford / Alpacas {Lama pacos} Andes. Ecuador.

Pete Oxford / Alpacas {Lama pacos} Andes. Ecuador.

Pete Oxford / Cotopaxi Volcano (5897 meters) and herd of Alpacas (Lama pacos), Highest active volcano in the world, surrounded by Paramo Habitat, Cotopaxi National Park, Andes, Ecuador