All Videos Tagged nature (Atheist Nexus) - Atheist Nexus 2015-07-03T07:21:36Z http://atheistnexus.org/video/video/listTagged?tag=nature&rss=yes&xn_auth=no Researchers Reconstruct the Common Ancestor of Placental Mammals tag:atheistnexus.org,2013-02-09:2182797:Video:2160012 2013-02-09T02:49:58.889Z Donegal http://atheistnexus.org/profile/Donegal <a href="http://atheistnexus.org/video/researchers-reconstruct-the-common-ancestor-of-placental-mammals"><br /> <img alt="Thumbnail" height="180" src="http://api.ning.com:80/files/rRlLHC*Dey06CdPm-iO3fNSDb7viIkmB7YCFXV1Rj254BeO-v*xQPxU7Q4ltzKd-JIdpp0ubljegd7KTtn*vszAO5Flo0c5I/1008498120.jpeg?width=240&amp;height=180" width="240"></img><br /> </a> <br></br>A tiny, furry-tailed creature was the earliest ancestor of placental mammals -- a widely diverse group of animals ranging from bats to humans -- according to a new study by a team of international scientists, including a core group of Museum researchers. In findings published in the February 8 issue of the journal Science, the researchers analyzed… <a href="http://atheistnexus.org/video/researchers-reconstruct-the-common-ancestor-of-placental-mammals"><br /> <img src="http://api.ning.com:80/files/rRlLHC*Dey06CdPm-iO3fNSDb7viIkmB7YCFXV1Rj254BeO-v*xQPxU7Q4ltzKd-JIdpp0ubljegd7KTtn*vszAO5Flo0c5I/1008498120.jpeg?width=240&amp;height=180" width="240" height="180" alt="Thumbnail" /><br /> </a><br />A tiny, furry-tailed creature was the earliest ancestor of placental mammals -- a widely diverse group of animals ranging from bats to humans -- according to a new study by a team of international scientists, including a core group of Museum researchers. In findings published in the February 8 issue of the journal Science, the researchers analyzed the world's largest dataset of genetic and physical traits to find that placental mammals diversified into present-day lineages much later than is commonly thought: after the extinction event 65 million years ago that eliminated non-avian dinosaurs. This finding, and the visualization of the placental ancestor -- an insect-eating animal that weighed less than a pound -- was made with the help of a cloud-based and publicly accessible database called MorphoBank.<br /> <br /> MorphoBank is an initiative funded primarily by NSF with additional support from Stony Brook University, the American Museum of Natural History, the National Oceanic and Atmospheric Administration, and the National Evolutionary Synthesis Center.<br /> <br /> Visit MorphoBank: <a href="http://mammaltree.informatics.sunysb.edu/">http://mammaltree.informatics.sunysb.edu/</a> Bird Brains Primed for Cooperation tag:atheistnexus.org,2011-11-04:2182797:Video:1720669 2011-11-04T18:04:00.589Z Donegal http://atheistnexus.org/profile/Donegal <a href="http://atheistnexus.org/video/bird-brains-primed-for-cooperation"><br /> <img alt="Thumbnail" height="180" src="http://api.ning.com:80/files/ydJ34wRJBUyfz2CVirBMXeOqu0FmbVVxJZlMX7rjd6QhgdynaVBRGrDbla8UwXVqH4FuOl0CmI14zl8s5ZV6PBAE7H4WKm8-/780690355.jpeg?width=240&amp;height=180" width="240"></img><br /> </a> <br></br>Long-married human couples may finish each others' sentences, but the plain-tailed wrens of the Andes take things a step further. Male and female wrens sing intimate duets in which they alternate syllables so quickly it sounds like a single bird is singing. New research shows that the brains of both the male and female wrens actually process the entire duet, not just each bird's… <a href="http://atheistnexus.org/video/bird-brains-primed-for-cooperation"><br /> <img src="http://api.ning.com:80/files/ydJ34wRJBUyfz2CVirBMXeOqu0FmbVVxJZlMX7rjd6QhgdynaVBRGrDbla8UwXVqH4FuOl0CmI14zl8s5ZV6PBAE7H4WKm8-/780690355.jpeg?width=240&amp;height=180" width="240" height="180" alt="Thumbnail" /><br /> </a><br />Long-married human couples may finish each others' sentences, but the plain-tailed wrens of the Andes take things a step further. Male and female wrens sing intimate duets in which they alternate syllables so quickly it sounds like a single bird is singing. New research shows that the brains of both the male and female wrens actually process the entire duet, not just each bird's own contribution.<br /> <br /> Eric Fortune of Johns Hopkins University discusses his research. Frozen Planet (15 min. preview) tag:atheistnexus.org,2011-10-28:2182797:Video:1713239 2011-10-28T11:03:23.692Z Donegal http://atheistnexus.org/profile/Donegal <a href="http://atheistnexus.org/video/frozen-planet-15-min-preview"><br /> <img alt="Thumbnail" height="180" src="http://api.ning.com:80/files/tAxqucRfG3QwH3-DiKMGQo0pcDNZXA2tgs2L6JkZO5VlJKKGDB8IrWEdm6KcZKvTIjZhpAy*K*88pEncKAIMI8MKh1isljML/476372989.jpeg?width=240&amp;height=180" width="240"></img><br /> </a> <br></br>Frozen Planet is a BBC natural history series that has just begun to be broadcast.<br></br> <br></br> The clips in this video come from Part 1 - "To the Ends of the Earth".<br></br> <br></br> It is an outstanding programme that I would strongly recommend.<br></br> <br></br> It is available for viewing on the BBC site:…<br></br> <a href="http://atheistnexus.org/video/frozen-planet-15-min-preview"><br /> <img src="http://api.ning.com:80/files/tAxqucRfG3QwH3-DiKMGQo0pcDNZXA2tgs2L6JkZO5VlJKKGDB8IrWEdm6KcZKvTIjZhpAy*K*88pEncKAIMI8MKh1isljML/476372989.jpeg?width=240&amp;height=180" width="240" height="180" alt="Thumbnail" /><br /> </a><br />Frozen Planet is a BBC natural history series that has just begun to be broadcast.<br /> <br /> The clips in this video come from Part 1 - "To the Ends of the Earth".<br /> <br /> It is an outstanding programme that I would strongly recommend.<br /> <br /> It is available for viewing on the BBC site:<br /> <a href="http://www.bbc.co.uk/iplayer/episode/b00zj1q5/Frozen_Planet_To_the_Ends_of_the_Earth/">http://www.bbc.co.uk/iplayer/episode/b00zj1q5/Frozen_Planet_To_the_Ends_of_the_Earth/</a><br /> <br /> If the link doesn't work don't blame me!<br /> <br /> A search on the Internet for "Frozen - Planet - David - Attenborough" and you will find the full programme. Bill Nye: 100 Greatest Discoveries : Evolution (Discovery Channel) tag:atheistnexus.org,2011-09-05:2182797:Video:1608126 2011-09-05T01:38:44.471Z Donegal http://atheistnexus.org/profile/Donegal <a href="http://atheistnexus.org/video/bill-nye-100-greatest-discoveries-evolution-discovery-channel"><br /> <img alt="Thumbnail" height="180" src="http://api.ning.com:80/files/FBjM0tY3qE8gW8Nx-IGq*UMMrsekJMYBTTunmxepmi8*lhRl74OlGZOTFrIMRnI8mhS8kKmNsZrOKIrxosUbEu7G-z2Kubfb/882246116.jpeg?width=240&amp;height=180" width="240"></img><br /> </a> <br></br>From the discovery of the dinosaur-killing KT asteroid to Carl Linnaeus' still-used life form classification system to the groundbreaking theories of Charles Darwin. Learn how intelligent life began on earth.<br></br> <br></br> Part 2: <a href="http://youtu.be/Ntywwcm_geg">http://youtu.be/Ntywwcm_geg</a><br></br> <br></br> Part 3:… <a href="http://atheistnexus.org/video/bill-nye-100-greatest-discoveries-evolution-discovery-channel"><br /> <img src="http://api.ning.com:80/files/FBjM0tY3qE8gW8Nx-IGq*UMMrsekJMYBTTunmxepmi8*lhRl74OlGZOTFrIMRnI8mhS8kKmNsZrOKIrxosUbEu7G-z2Kubfb/882246116.jpeg?width=240&amp;height=180" width="240" height="180" alt="Thumbnail" /><br /> </a><br />From the discovery of the dinosaur-killing KT asteroid to Carl Linnaeus' still-used life form classification system to the groundbreaking theories of Charles Darwin. Learn how intelligent life began on earth.<br /> <br /> Part 2: <a href="http://youtu.be/Ntywwcm_geg">http://youtu.be/Ntywwcm_geg</a><br /> <br /> Part 3: <a href="http://youtu.be/JaEg9q65DuM">http://youtu.be/JaEg9q65DuM</a><br /> <br /> Please Subscribe To The WhyEvolutionIsTrue Youtube Channel. <a href="http://www.youtube.com/WhyEvolutionIsTrue">http://www.youtube.com/WhyEvolutionIsTrue</a><br /> <br /> 100 Greatest Discoveries Episode List:<br /> <a href="http://tinyurl.com/3kwnltl">http://tinyurl.com/3kwnltl</a><br /> <br /> Discovery Channel Documentary List:<br /> <a href="http://tinyurl.com/6ammcf3">http://tinyurl.com/6ammcf3</a> Gender Role Reversal In Jacanas tag:atheistnexus.org,2011-08-24:2182797:Video:1571283 2011-08-24T13:26:58.915Z Donegal http://atheistnexus.org/profile/Donegal <a href="http://atheistnexus.org/video/gender-role-reversal-in-jacanas"><br /> <img alt="Thumbnail" height="180" src="http://api.ning.com:80/files/jtJ*qNn0PbWEG8PQd1TQrj9HC9X-KC1k3mwGQ1ZoYrMogwreA*0hP7OWmFjSKkOJDvyLmB7naPAqwIMeCGOERDv0NL*RLyd4/982932224.jpeg?width=240&amp;height=180" width="240"></img><br /> </a> <br></br>A switch in traditional gender-role behavior gives an advantage to male and female shorebirds called jacanas. Found in tropical regions, jacanas have evolved a social system that confused early ornithologists into mistaking males for females.<br></br> <br></br> In a sexually reproducing species, males and females are defined by the kind of gametes (reproductive cells) they produce. The… <a href="http://atheistnexus.org/video/gender-role-reversal-in-jacanas"><br /> <img src="http://api.ning.com:80/files/jtJ*qNn0PbWEG8PQd1TQrj9HC9X-KC1k3mwGQ1ZoYrMogwreA*0hP7OWmFjSKkOJDvyLmB7naPAqwIMeCGOERDv0NL*RLyd4/982932224.jpeg?width=240&amp;height=180" width="240" height="180" alt="Thumbnail" /><br /> </a><br />A switch in traditional gender-role behavior gives an advantage to male and female shorebirds called jacanas. Found in tropical regions, jacanas have evolved a social system that confused early ornithologists into mistaking males for females.<br /> <br /> In a sexually reproducing species, males and females are defined by the kind of gametes (reproductive cells) they produce. The individuals who produce lots of small, mobile gametes are called males. Those who invest everything in a relatively few large gametes are called females. Because of all the resources a female will put into each egg, it makes sense, in most cases, for her to be choosy about whose genes she allows to combine with it, and to continue to invest in its growth and survival after fertilization. For the male, it usually pays best to compete with other males for access to as many eggs as possible. This tends to give rise to the more traditional male/female sex roles.<br /> <br /> But there is nothing inevitable about these familiar sex roles. Evolution favors whatever works, and for the jacana, what works is quite different.<br /> <br /> To begin with, female jacanas weigh 60 percent more than males and can lay many successive "clutches" of eggs in a single breeding season. Once their eggs are on the ground, the females are gone, leaving the males to incubate the eggs and take care of the newborn young. Males even have special wing adaptations that allow them to carry two chicks under each wing.<br /> <br /> The aggressive females, meanwhile, are busy gathering harems of as many as five males, mating promiscuously and defending territory against other females. Not only that, female jacanas will move in on another female's territory, go to the nest, and kill the chicks. Freed from his parenting duties, the male then becomes the object of the invading female's courting. If successful, the mating is followed a week later by a new clutch of eggs for the male to incubate.<br /> <br /> This entire system based on female dominance has evolved, some researchers believe, to compensate for an extraordinarily high rate of egg loss to predators. The world of the jacana has, in effect, turned the female into "an egg-making machine," says Cornell University biologist Stephen Emlen, who has spent years studying the remarkable adaptation. And it is the males who are primarily responsible for the care of the young.<br /> <br /> One lesson from the jacana is that the behaviors we automatically label "male" or "female" aren't something inherent in the physiology or looks of the individual. For the jacana, it's just an unusual way of giving their offspring -- and their genes -- a better chance at survival.<br /> <br /> Please Subscribe To The WhyEvolutionIsTrue Youtube Channel.<br /> <a href="http://www.youtube.com/WhyEvolutionIsTrue">http://www.youtube.com/WhyEvolutionIsTrue</a><br /> <br /> More Short Videos On Evolution:<br /> <a href="http://tinyurl.com/3sfgtrn">http://tinyurl.com/3sfgtrn</a>