Magnus Lundgren / Wild Wonders of China / Red Helen swallowtail butterfly caterpillar (Papilio helenus) showing snake mimicry, Tai Mo Shan Country Park, Hong Kong, China

Richard Robinson / Helen's triplefin (Ceratobregma helenae) at Vautoa Ono, Lau Island Group, Fiji.

Tim Fitzharris / Mount Helen from Two Medicine Lake, Glacier National Park, Montana

Tim Fitzharris / Mount Helen from Two Medicine Lake, Glacier National Park, Montana

Angelo Gandolfi / Blue morpho (Morpho helenor) butterflies feeding on mango fruit, butterfly observatory, La Paz Waterfall Gardens, Costa Rica.

Colin Monteath/ Hedgehog House / Sunset on cliff and billabong, Finke River, Glen Helen Gorge, MacDonnell Ranges, Northern Territory, Australia

Colin Monteath/ Hedgehog House / Sunset on cliff and billabong, Finke River, Glen Helen Gorge, MacDonnell Ranges, Northern Territory, Australia

Kevin Schafer / Ice melting on Lake Helen, Mount Lassen, Lassen Volcanic National Park, California

Nature Production / Chrysalis of Red helen swallowtail butterfly (Papilio helenus nicconicolens) Japan

Nature Production / Caterpillar larva of Red helen swallowtail butterfly (Papilio helenus nicconicolens) Japan

Robert Thompson / Swallow prominent moth (Pheosia tremula) resting on bark, Helen's Bay, County Down, Northern Ireland, UK

Barry Bland / British Olympic K1 kayaker, Helen Reeves, practising at the Olympic Kayaking Centre, Olympic Games 2004, Athens, Greece. Editorial Use Only.