Markus Varesvuo / Jack snipe (Lymnocryptes minimus), Uto, Finland, November.

Robin Chittenden / Boy looking at Green-veined White butterfly (Pieris napi) on his hand, Dorset, UK, May 2013, Model released.

Neil Lucas / Weddell seal (Leptonychotes weddellii) male surfacing in ice hole, McMurdo Sound, Ross Sea, Antarctica, November 2008

Mark Taylor / Blue eyed tabby and white Siberian cross kitten, age 13 weeks.

Mark Taylor / Blue eyed tabby and white Siberian cross kitten, age 13 weeks.

Mark Taylor / Blue eyed tabby and white Siberian cross kitten, age 13 weeks.

Jane Burton / Blue bicolour and odd-eyed white Persian-cross kittens among maywood and yarrow flowers.

Jane Burton / Odd-eyed white and black bicolour Persian-cross kittens, among Rosebay Willowherb.

Jane Burton / Blue-eyed bicolour ragdoll-cross kitten, Fergus, among frosty everlasting daisies and cow parsley deadheads.

Adrian Davies / Primrose (Primula vulgaris) pin eyed specimen with protruding stigma, as opposed to protruding stamens (known as thrum eyed)

Nick Upton / Common primrose (Primula vulgaris) Pin-eyed flowers close up. Wiltshire meadow, UK, April.

LYNN M. STONE / A white, cross-eyed Bengal Tiger cub (Panthera tigris tigris) captive