Ключевые слова: ancient, animal, animals, antique, background, big, biology, bones, clam, claw, crawdad, crayfish, creature, discovery, etching, evolution, exhibit, extinct, fossil, fragmentary, geological age, head, history, history of life, mammoth, mammuthus, natural, nature, old, paleontology, past, petrified, prehistoric, relic, relict, remains, remote, science, siberia, still, stone, teeth, tooth, treasure, unearthed, white, wildlife, wreck, zoology,