Espen Bergersen / Killer whale / orca (Orcinus orca). Spyhopping very close, showing eye. Kvanangen, Troms, Norway. November

Alex Mustard / Sharpnose puffer (Canthigaster rostrata) portrait with the eyes standing out against a dark background, East End, Grand Cayman, Cayman Island, British West Indies, Caribbean Sea.

Tim Laman / Head portrait of a Wild Western / Sunda tarsier (Tarsius bancanus) on tree trunk at night. Danum Valley Conservation Area, Borneo, Sabah, Malaysia

Edwin Giesbers / Shed skin of grass snake {Natrix natrix} on lilypad, Netherlands.

Claudio Contreras / Grey whale (Eschrichtius robustus) eye, Magdalena Bay, Baja California, Mexico, February. Winner in the Ocean Views category of the 2018 Nature's Best Winland Smith Rice Awards.

Franco Banfi / Sperm whale (Physeter macrocephalus) eye detail, Dominica, Caribbean Sea, Atlantic Ocean, Vulnerable.

Tony Wu / Sperm whales (Physeter macrocephalus) group of females moving slowly. Closed eye of the whale in the foreground, and the relaxed body language of all the animals indicates they are relaxing. Sri Lan...

Doc White / Gray whale (Eschrichtius robustus) Scammons Lagoon, Baja California, Mexico

Doc White / Gray whale (Eschrichtius robustus) eye up close, Scammons Lagoon, Baja California, Mexico

Jordi Chias / Short-finned pilot whale (Globicephala macrorhynchus) at surface, showing eye, South Tenerife, Canary Islands, Atlantic Ocean, July

Espen Bergersen / Humpback whale (Megaptera novaeangliae) lunge feeding on herring (Clupea harengus) note the whale's eye is visible, Kvaloya, Troms, Norway, November

Espen Bergersen / Humpback whale (Megaptera novaeangliae) lunge feeding on herring (Clupea harengus) bubble net feeding behaviour, note the eye and ventral grooves, Kvaloya, Troms, Norway October