Matt shows us how to use one of the most primitive yet highly efficient hunting tools.
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Live Free or Die follows five members of a remote but growing American subculture of self-proclaimed Re-Wilders who’ve vowed to leave the modern world behind in order to survive in backwoods, deserts, mountains and swamps by hunting their own food, building their own shelters, and finding their own water – using only their own two hands, sharp intuition and time tested methods.
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While researching lions in Zambia, biologist Thandiwe Mweetwa noticed that lionesses within a pride will all have cubs around the same time.
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When she looked into it further, Mweetwa learned lionesses sync their fertility cycles so that they can all raise their young together. There’s a reason for that. “Synchronized estrus is thought to increase reproductive success in the pride,” says Mweetwa, a National Geographic emerging explorer. Having cubs at the same time means that mother lions can rely on each other to nurse, babysit, and protect the youngsters. This safety in numbers also allows more lions to survive to adulthood. Predation is a great threat to small, vulnerable babies in any species, but if all babies are born at the same time, there are only so many that predators can eat. If young are born at different times throughout the year, predators could use them as a steady source of food. Even so, many still die: More than half of all African lion cubs don’t make it past their first year. They’re at risk from predation, disease, abandonment, starvation, and being killed by an outside male. When male lions strike out on their own, they will challenge another male for control of his harem. If the interloper succeeds, he’ll kill all the cubs, which brings the females into estrus, or heat, again. Though many other animals come into heat at the same time, fewer species go into heat when their young die. Instead, most go into heat seasonally, including most wild species of hooved mammals, which only give birth in the spring. Male deer testosterone peaks in fall, during the “rut,” when they will compete for and mate with females. Does are pregnant during the winter and give birth around May and June, when warmer weather helps fawns survive. If lions had periods, lionesses within a pride might get them at roughly the same time. But lions don’t menstruate: The only mammals that menstruate overtly the way that humans do are some other primates and a few species of bats and rodents. A persistent myth is that people living in close proximity—such as several women sharing a dorm in college—synchronize their estrus cycles, which is evidenced by having periods around the same time. This idea, which caught on due to research by psychologist Martha McClintock in 1971, has been discredited in several studies since. In 2006, Zhengwei Yang and Jeffrey C. Schank found the chance that a woman would share a cycle with someone living with her is about as likely as sharing it with anyone else. Because women have slightly different menstrual cycles, there is a good chance that, if two women spend enough time together, they will eventually match cycles. “It’s just a mathematical property of irregular rhythms, and rhythms of different lengths,” says Schank. He adds that it’s human nature to notice when things match, but not to notice when they don’t match. Since menstruation also wastes nutrients and can attract predators, with all the other problems that lion cubs face it’s lucky that at least lionesses don’t have periods. (Article by Kristin Hugo)
Thandiwe Mweetwa is a Big Cat’s Initiative Grantee, working to save lions in Zambia. The National Geographic Society’s Big Cats Initiative is a long-term effort to halt the decline of lions, leopards, cheetah and other big cats in the wild. The initiative supports efforts to save big cats through assessment, on-the-ground conservation, education, and global public-awareness campaigns. Learn more about the initiative: http://nationalgeographic.org/projects/big-cats-initiative/about/
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http://nationalgeographic.org/projects/explorers-week/thandiwe-mweetwa/
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TIL: Female Lions Synchronize Their “Periods” | Today I Learned
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Found everywhere from the rim of a lava lake to the inside an iceberg, microbes are remarkable organisms that can live in places humans can only dream of. How do they do it? And what can we learn from them about the limits of life both on our planet and elsewhere in our solar system? Geobiologist Jeffrey Marlow, a 2016 National Geographic emerging explorer, is working on answering these questions. Much of Marlow’s focus has been on the deep sea and exploring microbial metabolism. He is particularly interested in microbes on the sea floor that convert the greenhouse gas methane into rock. Might we be able to harness these microbes’ metabolism to turn methane into biofuel? Marlow takes the stage to talk about these remarkable organisms and the passion that drives him to keep exploring the most extreme environments on our planet.
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Explore the scenery and the incredible diversity of plants and animals that makes Great Smoky Mountains the most visited park in the National Park system.
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America’s National Parks fascinate millions of visitors. This spectacular series will show you what happens beyond the lookouts. More than 3 years in the making will enable the audience to witness moments full of drama, watch stories of life and death and discover hidden gems they never believed could be found in a place they thought they knew. Follow us on an epic journey from the geysers of Yellowstone to the rugged Pacific coast of the Olympic peninsula, from the hot desert of Saguaro to the icy Gates of the Arctic, from the subtropical sea of grass in the Everglades to the world-famous peaks of Yosemite and from the mystic Smoky Mountains to the biggest gorge on Earth: the Grand Canyon. America’s National Park made for the Centennial of the National Park Service and brought to you by National Geographic will present you North America’s natural wonders as you have never experienced them before.
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Best Of Great Smoky Mountains National Park | America’s National Parks
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