Ingo Arndt / Great Bowerbird (Chlamydera nuchalis) male at courting bower, Litchfield National Park, Australia.

SCOTLAND: The Big Picture / Close up of pebbles on beach, Scotland, UK, October.

David Tipling / Illustration of Woodcock (Scolopax minor) from 1861 entitled Game birds of America by H.M. Clay.

Niall Benvie / Egg-shaped piece of Lewisian gneiss, Isle of Lewis, Argyl. Scotland, UK

Roland Seitre / Sulawesi forest turtle (Leucocephalon yuwonoi) egg held in hand, captive breeding program at Allwetterzoo Muenster, Germany.

Enrique Lopez-Tapia / Egg-shaped granitic boulder overlooking landscape. Karlu Karlu / Devils Marbles Conservation Reserve, Northern Territory, Australia. 2008.

Enrique Lopez-Tapia / Egg-shaped granitic boulder split in two, weathering caused by extreme desert temperatures. Karlu Karlu / Devils Marbles Conservation Reserve, Northern Territory, Australia.

Enrique Lopez-Tapia / Granitic boulder. Karlu Karlu / Devils Marbles Conservation Reserve, Northern Territory, Australia.

Emanuele Biggi / Lord Howe Island stick insect (Dryococelus australis) eggs developing in damp vermiculite, part of a breeding program at Bristol Zoo Gardens, Bristol, UK.

David Hall / Merten's chiton (Lepidozona mertensi), Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / Chiton (Mopalia sp., probably Mopalia spectabilis); Browning Pass, Queen Charlotte Strait, British Columbia, Canada. October.

David Hall / Lined chiton (Tonicella lineata); Browning Pass, British Columbia, Canada. September.