Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Young man rides a grey mare horse in a cross-country eventing competition, Oxfordshire, United Kingdom

Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nest and breeding area for blue-footed boobies.

blue-footed booby (Sula nebouxii). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nest and breeding area for blue-footed boobies.

Blue-footed booby (Sula nebouxii). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nest and breeding area for blue-footed boobies.

Red-footed booby (Sula sula). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Red-footed booby (Sula sula). Galapagos.

Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nest and breeding area for blue-footed boobies.

Brown booby, Sula leucogaster, male pecking at female, St. Peter and St. Paul's rocks, Brazil, Atlantic Ocean

Aerial view, nomads with clumsy animals roaming the barren steppe, Khovd Province, Mongolia, Asia

Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Social interaction and behaviour in a group. Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Landing in a colony. Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic, Denmark, Northern Europe

Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Group on empty beach. Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Group on empty beach. Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Tara Oceans Expeditions - May 2011. diving Marine Iguana (Amblyrhynchus cristatus); Isabela Island; Galapagos, Ecuador; The Marine Iguana appears slow and clumsy on land, but this particular species of lizard is the only sea-going lizard in the world. However, it has to return the the land to breed.