Heike Odermatt / King Penguin (Aptenodytes patagonicus) trio, Saunders Island, Falkland Islands

Steve Gettle / Western Grebe (Aechmophorus occidentalis) pair in courtship dance, North Dakota

Edwin Giesbers,Edwin Giesbers / Sumatran tiger (Panthera tigris sumatrae) close-up head portrait, captive

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Wild Wonders of Europe / Relanzón / Ice plant (Mesembryanthemum crystallinum) flower, North Lanzarote, Canary Islands, Spain, March 2009

Tim Fitzharris / Common Sunflower (Helianthus annuus) group showing symmetrical seed heads, North America

Ingo Arndt / Ctenophore (Beroe cucumis) showing typical symmetrical combs made of cilia, Weddell Sea, Antarctica

Pascal Kobeh / Symmetrical brain coral (Diploria sp), close up, in coral reef with many fish. Flores Sea, Indonesia.

Richard Du Toit / Northern Giraffe (Giraffa camelopardalis) pair, Kgalagadi Transfrontier Park, South Africa

Glenn Bartley/ BIA / Snow Goose (Chen caerulescens) pair flying, New Mexico

Steve Gettle / Tiger Swallowtail (Papilio glaucus) butterfly, Howell Nature Center, Michigan