Ingo Arndt / Cape fur seals (Arctocephalus pusillus) at colony, Cape Cross, Namibia, December

Juan Carlos Munoz / People exploring underground lakes via rigid inflatable boat, Cross Cave (Krizna jama) under Cross Mountain, Green Karst, Slovenia, October 2014.

Jack Dykinga / Eroded formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the night sky...

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...

Anup Shah / Black backed jackal (Canis mesomelas) feeds on Cape Fur Seal pup (Arctocephalus pusillus) in colony at Cape Cross Seal Reserve, Namibia

Anup Shah / Cape Fur Seal pup (Arctocephalus pusillus pusillus) fends off Black backed jackal (Canis mesomelas) Cape Cross Seal Reserve, Namibia

Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia

Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia

Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia

Martin Dohrn / The Southern Cross star constellation shining above Ballenites trees in Masai Mara, Kenya. Starlight image intensifier camera image taken with no artificial light.

Juan Carlos Munoz / Sun setting behind Castelo Mendo. Middle Coa, Archaeological Park of the Coa Valley, Western Iberia, Portugal. April 2016.

Pedro Narra / Cape fur seal (Arctocephalus pusillus) Cape Cross seal colony, Namibia