Daniel Heuclin / Blue iguana (Cyclura lewisi) captive, endangered species occurs in Cayman Islands.

Jack Dykinga / 'Perfect Kiva' ruins of Anasazi indians, Bullet Canyon, Grand Gulch Primitive Area, Utah, USA

Norbert Wu / Australian Ghost Shark (Callorhinchus milii) trunk-like snout detects prey in sea bottom, primitive fish relative to sharks, lives in the deep sea, New Zealand

Norbert Wu / Larvacean (Oikopleura labradorensis) house, primitive animal spins mucus web, Arctic

David Hall / Compound ascidian (Ascidiacea sp possibly Botryllus sp). Pantar, Alor Archipelago, Indonesia.

Will Watson / Devonian sandstone with trace fossil. Tetrapod tracks created by a primitive four-limbed vertebrate circa 385 Million years ago. One of the oldest vertebrate tracks in the world. Valentia Island, Coun...

John Cancalosi / Confuciusornis sp. fossil. This genus was a primitive crow-sized bird from the Early Cretaceous Yixian and Jiufotang Formations of China, dating from 125 to 120 million years ago

Roy Mangersnes / Marine iguana (Amblyrhynchus cristatus) sneezing, expelling salt at sunset, Fernandina Island, Galapagos.

Julian Hume / Illustration of extinct O'ahu koa finch (Rhodacanthis litotes) in a Koa (Acacia koa) Hawaii.

John Abbott / Barklouse (Metylophorus novaescotiae), Tuscaloosa County, Alabama, USA October

John Abbott / Fishfly (Neohermes concolor) male flying, Tuscaloosa County, Alabama, USA Controlled conditions. May

John Cancalosi / Konik ponies or Polish primitive horse believed by some to be closely related to the European wild horse. These horses are often used in grazing management practices in wildife reserve. UK, August 201...