First Video of Fish Leaping Into Air to Prey on Birds


This Post is originally from nationalgeographic.com

The last thing a barn swallow probably expects as it’s flying low over a lake is to be met with a mouthful of needle-sharp teeth emerging from the water. And if the bird happens to be flying over a certain lake in South Africa, that may well be the last thing it sees.

A recent study has caught what researchers say are the first scientific observations of a fish launching itself out of the water to catch birds in midair.

Fish preying on birds is not unusual, but it’s not a common part of many fish species’ diets either.

“There are more than 14,000 freshwater fish species in the world,” wrote Nico Smit, director of the unit for environmental sciences and management at North-West University in Potchefstroom, South Africa, in an email. “[But] of those, only about five species are known to prey on birds, so I definitely don’t think it is a widespread  behavior.”

For the most part, when fish feed on birds, it’s a meal of opportunity, Smit noted. Either the birds have accidentally fallen into the water, or waterfowl like ducks just happen to paddle over the wrong stretch of a lake or river.

But during a 15 day survey in February 2010, Smit and colleagues saw African tigerfish—which populate a storage lake for the Schroda Dam in South Africa—snatching barn swallows out of the air, they report in a study published online last month in the Journal of Fish Biology.

 

News-graphic-tigerfish-500px

Unlike other instances of fish eating birds, barn swallows actually seem to be a fairly regular part of a tigerfish’s summer diet when the swallows are available, Smit said. “[The fish] have been incredibly well adapted to hunt the flying birds as part of their daily routine.”

Video taken by study co-author Francois Jacobs, also of  North-West University in South Africa, is just getting major media attention now.

Beginning around twilight, tigerfish near the Schroda Dam patrol deep open water near well-vegetated areas. They exhibit a less active lifestyle during the day, which they spend in the deeper, more sheltered water, the study authors write.

But during the 2011 survey, researchers noticed that five of the tigerfish (Hydrocynus vittatus)they had tagged exhibited increases in their midmorning activities.

Smit and colleagues did not observe any of their tagged fish leaping for barn swallows (Hirundo rustica), but they did observe other tigerfish catching the birds in midair.

The fish would either follow the birds in a surface pursuit before leaping up to try and catch them, or the tigerfish would track the swallows from deeper in the water and launch into the air to ambush them.

Smit marvels at the skill it takes for these fish to capture birds on the wing. Tigerfish have to spot a fast-flying swallow from the water, exceed the bird’s speed, compensate for refraction—or the fact that the angle of light changes when it goes from air to water—and then leap out of the water to grab the bird, he explained.

Over the course of their study, researchers saw up to 20 successful attempts on flying barn swallows by tigerfish in one day.

A young barn swallow perches on a branch in Botswana. Photograph by Vincent Grafhorst, Foto Natura/Corbis
A young barn swallow perches on a branch in Botswana. Photograph by Vincent Grafhorst, Foto Natura/Corbis

“During the 15-day survey as many as 300 [barn swallows] were preyed upon by the local [tigerfish] population, indicating that this feeding behavior is not occasional,” the study authors write.

They speculate that the scarcity of other food in the Schroda Dam lake, like other species of fish, have driven these tigerfish to attempt loftier prey.

“I think this research also illustrates that we still actually know incredibly little about the behavior of freshwater fish in Africa,” Smit said. “The fact that this amazing behavior has escaped documentation for so long surely means that a lot more needs to be discovered.”

Follow Jane J. Lee on Twitter.

Change The Way You Look At Boobs


More boob facts than you can handle.
All the breast facts we could squeeze out.
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Film Footage courtesy of Shutterstock, Inc., Used by Permission

1950s – LSD psychology experiments of the 1950s.

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Young man looking at young woman through telescope as she lifts her top and shows her bra. Horizontal shot./Morgan DDL
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Sexy Halloween Costumes You Won’t Believe Exist


16 “sexy” costumes that should never have been made.

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Costumes from http://www.yandy.com

Based on this BuzzFeed community post:
http://www.buzzfeed.com/caraf5/21-sex…

Check out The Guide To Trading Halloween Candy:
http://www.youtube.com/watch?v=wGdYhm…

Music credit:
Muchbad
https://soundcloud.com/muchbad/muchba…

Additional photo credits:
Shutterstock
http://ferryqueen.deviantart.com/art/…
http://www.fanpop.com/clubs/spongebob…
http://poohadventures.wikia.com/wiki/…
http://www.wpclipart.com/food/vegetab…
http://www.officialnickelodeoncostume…

Audio clip credits:
http://www.youtube.com/watch?v=Lwy26O…
http://www.youtube.com/watch?v=3zRWE1…
http://www.youtube.com/watch?v=CJEoAS…

More videos at…
http://www.youtube.com/buzzfeedvideo
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How to Kiss Dirty | Kissing Tips


Wow wow wow, Anybody out there want to know how to dirty kiss? Then this video will definitely help you achieve it! Ever wanted to make your partner understand what you really want in your intimate relationship? but don’t know how to share it with them? and looking an easy and sophisticated way to express what your really want in your intimacy? then you can ask your partner to watch this video and I hope it will really help you improve the bond between your partner.

Weird Facts About Women


Fast brains and smelly farts
Share on FB: http://on.fb.me/18luYVT (you can add a note)
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Credits:

Strip — The Timid Dressmaker:
http://archive.org/details/Strip-TheT…

Rasputin And The Princess:
http://archive.org/details/RasputinAn…

Music: https://soundcloud.com/malefique/what…

Fact Resources:
Do Men and Women Have Different Brains:
http://science.howstuffworks.com/life…

Stuff Mom Never Told You (podcast): Lady Farts
https://itunes.apple.com/us/podcast/s…

Is It True That Small-Breasted Moms Produce Less Milk?
http://www.babycenter.com/404_is-it-t…

The Equatorial Enigma: Why Are More Girls Than Boys Born in the Tropics — and What Does It Mean?
http://www.independent.co.uk/news/sci…

Cry Me A River: Why Men And Women Shed Different Tears
http://www.foxnews.com/health/2011/05…

We Were All Female
http://www.youtube.com/watch?v=z1Kdoj…

Ellie Goulding – I Know You Care #song4syria


Donate to Save the Children’s Syria appeal now by downloading Ellie Goulding – I Know You Care #song4syria at http://ell.li/STCyt

The civil war in Syria is now in its third year. Nearly 7,000 children have died during the conflict, more than 2 million children within Syria have been forced to leave their homes and another million children have fled the country altogether. Many are traumatised, hungry, in urgent need of shelter and protection. Children are, once again, the innocent victims of war.

Save the Children is working inside Syria and neighbouring countries to ensure that Syria’s children get the food, medicines and protection they need. To donate to the Syria appeal and for more information please visit http://www.savethechildren.org.uk/abo…

Track provided by Ellie Goulding and Universal Music. Directed by Beeban Kidron.

Photography courtesy of: Rodrigo Abd, Louai Abo Al-Jod, Odd Andersen, Manu Brabo, Narciso Contreras, Dimitar Dilkoff, Diaa El Din, Getty Images, Hedinn Halldorsson, Mohammad Hannon, Jonathan Hyams, Daniel Leal-Olivas, Miguel Medina, Aris Messinis, Muhammed Muheisen, Tauseef Mustafa, Scott Peterson, Cesare Quinto, Thomas Rassloff, REX Features, Alessio Romenzi, Sam Tarling, Vedat Xhymshiti, Achilleas Zavaliss.

Aging women


An attempted to create a person in order to emulate the aging process. The idea was that something is happening but you can’t see it but you can feel it, like aging itself.
Still Photographer: Keith Sirchio
Animator: Nathan Meier
Animator: Edmund Earle
Nuke Artist: George Cuddy
Music: Mark Reveley
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markreveley.bandcamp.com
soundcloud.com/markreveley

Bombardier beetle’s defense mechanism


bombardier_beetle

The Bombardier beetle shoots boiling liquid as a defense mechanism

The incredibly complex bombardier beetle has an amazing and unique ability: when threatened it shoots boiling hot chemicals from its abdomen up to 70 times rapidly. The liquid is a combination of hydrogen peroxide and hydroquinones which join together inside the beetle causing a chemical reaction. The liquid is fatal to small insects and creatures and can be very painful to humans.