The Fate of the Mammoth
Paleontologists have advanced several theories to explain mammoths' rapid disappearance at the end of the last ice age, including meteors, diseases, climate change and human hunting. Evidence for meteor strikes has failed to materialize. As for human- or dog-borne diseases, experts say that it's hard to imagine a bug that could kill such a wide range of animals and only affect the large ones [sources: Lister and Bahn; UCMP]. That leaves climate and hunting.
As far as we know, mammoths could not live in areas akin to today's steppes, deserts, savannas or tropical forests, but were confined to the mix of plants peculiar to the mammoth steppe and parkland biomes. According to the climate hypothesis, that specialization may have doomed them to isolation and starvation. As the climate shift melted glaciers and raised sea levels, continents shrank and wetter conditions prevailed. Ill-adapted to such conditions, mammoth food sources dwindled, and mammoth populations declined with them [sources: Lister and Bahn; Mueller; Saey; Willerslev et al.].
Like the disease hypothesis, the overkill hypothesis emphasizes the fact that mammoths' shockingly fast decline coincides with the generally accepted arrival of humans in North America 13,300-12,800 years ago. It argues that big-game hunters, wielding spears with fluted, hafted Clovis points, hunted mammoths to extinction. Clovis points have been found with mammoth bones, and we know that humans used mammoth furs, meat and ivory. Moreover, we have found that both Neanderthals and Stone Age humans constructed buildings from mammoth bone [sources: Bower; Demay, Péan and Patou-Mathis].
But many questions remain. Given that many humans could have survived on a single mammoth, especially aided by natural refrigeration, and that early humans venerated the beasts in cave art, it's possible they treated mammoths with the reverence and restraint that Native Americans used toward buffalo [source: MGP]. Either way, hunter-gatherers likely had a varied diet and relied on small to medium game for meat, so how often they actually hunted mammoths (versus scavenging their remains) is unclear [sources: AMNH; Guthrie; Lister and Bahn].
Ultimately, the limitations of large mammals like mammoths, with their low birth rates and vast need for sustenance, might well have hastened their end, worsening the effects of isolation, habitat loss and predation, leaving only their dwarf descendants, cut off from the mainland on scattered islands, to carry on for another 6,000 years [sources: AMNH; Bower; Lister and Bahn; Nikolskiy and Pitulko].
Author's Note: How Woolly Mammoths Worked
Although the Pleistocene, with its climate wobbles and pulses of globe-spanning glaciation, might strike us as a fundamentally different sort of world than the one in which we live, the modern world is governed by the same forces and elements as the paleo. Now, as then, solar energy powers a complex, self-regulating climatological and ecological system that, though resilient, can rapidly collapse when pushed past a tipping point.
Whether mammoths were killed by hunters, by climate-driven starvation or some combination of the two is a question of much concern to their living cousins, the elephants, who once thundered across vast swaths of land and who today face human-driven habitat loss and poaching. The problem with tipping points is that they can move fast, have far-reaching impacts and quickly become virtually irreversible. The problem with allowing elephants to die, beyond the obvious tragedy, is that they are a keystone species in their ecosystems, potentially a kind of living tipping point. Their movements and activities create habitat for other animals and natural firebreaks, and their dung feeds numerous species, spreads seeds and provides soil nutrients. When an animal like that dies out, tipping point or not, it sends thunderous impacts throughout the ecosystem.
- American Museum of Natural History. "Could a Combination of Causes be Responsible for the Late Pleistocene Extinctions?" Humans and Other Catastrophes. (Jan. 22, 2015) http://www.amnh.org/science/biodiversity/extinction/Day1/combo/MainKeystone.html
- American Museum of Natural History. "What is the Overkill Hypothesis?" Humans and Other Catastrophes. (Jan. 22, 2015) http://www.amnh.org/science/biodiversity/extinction/Day1/overkill/Bit1.html
- BBC. "Proboscidea." (Jan. 23, 2015) http://www.bbc.co.uk/nature/life/Proboscidea
- BBC. "Woolly Mammoth." (Jan. 22, 2015) http://www.bbc.co.uk/nature/life/Woolly_mammoth
- Benazzi, Stefano. "Early Dispersal of Modern Humans in Europe and Implications for Neanderthal Behaviour." Nature. Vol. 479. Page 525. Nov. 24, 2011. (Jan. 21, 2015) http://www.nature.com/nature/journal/v479/n7374/full/nature10617.html
- Bower, Bruce. "Ancient Siberians May Have Rarely Hunted Mammoths." Science News. June 12, 2013. (Jan. 21, 2015) https://www.sciencenews.org/article/ancient-siberians-may-have-rarely-hunted-mammoths
- Bower, Bruce. "Neanderthals' Mammoth Building Project." Science News. Dec. 2, 2011. (Jan. 21, 2015) https://www.sciencenews.org/node/15131
- Campbell, Kevin L., et al. "Substitutions in Woolly Mammoth Hemoglobin Confer Biochemical Properties Adaptive for Cold Tolerance." Nature Genetics. Vol. 42. Page 536. (Jan. 26, 2015) http://www.nature.com/ng/journal/v42/n6/abs/ng.574.html
- Cohen, Claudine. "The Fate of the Mammoth: Fossils, Myth, and History." University of Chicago Press. 2002.
- Conard, Nicholas J. "Palaeolithic Ivory Sculptures from Southwestern Germany and the Origins of Figurative Art." Nature. Vol. 426. Page 830. Dec. 25, 2003. (Jan. 23, 2015) http://www.urgeschichte.uni-tuebingen.de/fileadmin/downloads/Conard/Conard_03_Nature.pdf
- Demay, Laëtitia, Stéphane Péan and Marylène Patou-Mathis. "Mammoths Used as Food and Building Resources by Neanderthals: Zooarchaeological Study Applied to Layer 4, Molodova I (Ukraine)." Quaternary International. Vol. 276. Page 212. Oct. 25, 2012. (Jan. 21, 2015) http://www.sciencedirect.com/science/article/pii/S1040618211006598
- Guthrie, R. Dale. "New Carbon Dates Link Climatic Change with Human Colonization and Pleistocene Extinctions." Nature. Vol. 441, no. 7090. Page 207. May 11, 2006. (Jan. 22, 2015) http://www.nature.com/nature/journal/v441/n7090/full/nature04604.html
- Higham, Tom et al. "The Earliest Evidence for Anatomically Modern Humans in Northwestern Europe." Nature. Vol. 479. Page 521. Nov. 24, 2011. (Jan. 21, 2015) http://www.nature.com/nature/journal/v479/n7374/full/nature10484.html
- Krause, Johannes et al. "Multiplex Amplification of the Mammoth Mitochondrial Genome and the Evolution of Elephantidae." Nature. Vol. 439. Page 724. Feb. 9, 2006. (Jan. 30, 2015) http://www.nature.com/nature/journal/v439/n7077/full/nature04432.html
- Lister, Adrian and Paul Bahn. "Mammoths: Giants of the Ice Age." University of California Press. First Edition, Revised. 2007.
- Mammoth Genome Project. "Mammoths and Human Society." Pennsylvania State University. (Jan. 23, 2015) http://mammoth.psu.edu/society.html
- Mueller, Tom. "Ice Baby." National Geographic. May 2009. (Jan. 26, 2015) http://ngm.nationalgeographic.com/2009/05/mammoths/mueller-text
- National Geographic. "Woolly Mammoth Fact File." NAT GEO WILD. (Jan. 26, 2015) http://natgeotv.com.au/tv/waking-the-baby-mammoth/woolly-mammoth-fact-file.aspx
- Nikolskiy, Pavel and Vladimir Pitulko. "Evidence From the Yana Paleolithic Site, Arctic Siberia, Yields Clues to the Riddle of Mammoth Hunting." Journal of Archaeological Science. June 5, 2013. (Jan. 21, 2015) http://www.sciencedirect.com/science/article/pii/S0305440313001957
- Perkins, Sid. "Mammoth Findings: Asian Elephant is Closest Living Kin." Science News. Dec. 20, 2005. (Jan. 22, 2015) https://www.sciencenews.org//node/10237
- Poinar, Hendrik. "Bring Back the Woolly Mammoth!" TEDxDeExtinction. March 2013. (Jan. 22, 2015) http://www.ted.com/talks/hendrik_poinar_bring_back_the_woolly_mammoth?language=en
- Rummer, Jodie L. "How Woolly Mammoth Blood Cheated the Cold." The Journal of Experimental Biology. Vol. 213. Aug. 1, 2010 (Jan. 26, 2015) http://jeb.biologists.org/content/213/15/v.1.full
- San Diego Zoo. "Mammoth Fact Sheet." (Jan. 25, 2015) http://library.sandiegozoo.org/factsheets/_extinct/mammoth/mammoth.htm
- Saey, Tina Hesman. "When Flowers Died Out In Arctic, So Did Mammoths." Science News. Feb. 6, 2014. (Jan. 21, 2015) https://www.sciencenews.org/article/when-flowers-died-out-arctic-so-did-mammoths?mode=magazine&context=188164
- Shoshani, Jeheskel. "Understanding Proboscidean Evolution: a Formidable Task." Trends in Ecology and Evolution. Vol. 13, no. 12. Page 480. December 1998, Pages 480–487. (Jan. 21, 2015) http://www.sciencedirect.com/science/article/pii/S0169534798014918
- Smithsonian magazine. "How Fast Can an Elephant Run?" http://www.smithsonianmag.com/videos/category/around-the-web/how-fast-can-an-elephant-run/?no-ist
- University of California Museum of Paleontology (UCMP). "About Mammoths." (Jan. 22, 2015) http://www.ucmp.berkeley.edu/mammal/mammoth/about_mammoths.html
- University of California Museum of Paleontology (UCMP). "Georges Cuvier (1769-1832)." (Jan. 23, 2015) http://www.ucmp.berkeley.edu/history/cuvier.html
- University of California Museum of Paleontology (UCMP_. "The Gomphotheriidae." November 2010. (Jan. 23, 2015) http://www.ucmp.berkeley.edu/mammal/mesaxonia/gomphotheriidae.php
- University of California Museum of Paleontology (UCMP). "The Proboscidea." November 2010. (Jan. 22, 2015) http://www.ucmp.berkeley.edu/mammal/mesaxonia/proboscidea.php
- Willerslev, Eske, et al. "Fifty Thousand Years of Arctic Vegetation and Megafaunal Diet." Nature. Vol. 506. Page 47. Feb. 6, 2014. (Jan. 21, 2015) http://www.nature.com/nature/journal/v506/n7486/full/nature12921.html