Donald M. Jones / Barren-ground Caribou (Rangifer tarandus groenlandicus) bull in tundra, central Alaska

Uri Golman / Greenland reindeer (Rangifer tarandus groenlandicus) in velvet, Kangerlussuaq, Greenland, June.

Uri Golman / Forest reindeer, (Rangifer tarandus fennicus) in velvet, Viiksimo, Kuhmo region. Finland, July. Rare subspecies which were nearly extinct in the 19th Century.

Uri Golman / Svalbard reindeer (Rangifer tarandus platyrhynchus) in velvet, resting, Svalbard, Norway, August.

Espen Bergersen / Svalbard reindeer (Rangifer tarandus platyrhynchus) rear view lying down, resting at sunset, Svalbard, Norway. April.

Sven Zacek / Roe deer (capreolus capreolus) buck with velvet antlers and fawn, Tartumaa, Estonia, March.

Sven Zacek / Roe deer (Capreolus capreolus) buck with velvet antlers and fawn at sunset, Tartumaa, March 2013.

Sven Zacek / Roe deer (Capreolus capreolus) buck with velvet antlers in snowy field at sunset, Tartumaa, Estonia, March.

Sven Zacek / Four Roe deer (Capreolus capreolus) bucks with velvet antlers and the shadow of a fifth buck, Tartumaa, Estonia, March.

Sven Zacek / Roe deer (capreolus capreolus) buck portrait, with velvet antlers. Tartumaa, Estonia, March.

Mark Hamblin / Reindeer (Rangifer tarandus) adult male, antlers in velvet, walking across upland moor, Cairngorms, Scotland, UK, August.

Staffan Widstrand / Svalbard reindeer (Rangifer tarandus platyrhynchus) with bloody antlers shedding velvet, Spitsbergen, Svalbard, Norway, September