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NATARAJAN

Researchers have found that the tiny brown thornbill mimics the hawk warning call to scare off predators. Image Courtesy: Thinkstock
one of Australia”s smallest birds found out a cunning way to protect its nest from predators by crying wolf, or rather hawk, and mimicking the warning calls of other birds.
Researchers from the Australian National University (ANU) found that the tiny brown thornbill mimics the hawk warning call of a variety of birds to scare off predators threatening its nest, such as the larger pied currawong.
“It is not superbly accurate mimicry but it is enough to fool the predator,” said Branislav Igic in a university statement.
A physical attack on a currawong would be no good. They are 40 times the size of a thornbill and will eat adults as well as nestlings.
“I am amazed that such a tiny bird can mimic so many species, some much bigger than itself. It’s very cunning,” Igic added.
Although vocal mimicry is widespread amongst birds, its function is rarely understood.
This study is the first to show that birds use vocal mimicry to scare predators.
The researchers stumbled across the thornbill’s deceit during an experiment on birds’ reaction to a stuffed owl.
“I was puzzled because I could hear the alarm calls of robins, honeyeaters and rosellas but I couldn’t see any,” added professor Robert Magrath, the leader of the research group.
He soon realised that the brown thornbill was mimicking the other species while defending the nest.
Many species of both birds and mammals eavesdrop on the alarm calls of other species. Natural communities form an information web about danger, the authors noted.
Source…www,ndtv.com
Natarajan
Reports have gone viral that the government is preparing for a large asteroid to hit Earth in September 2015.
The Truth:
The claim that a massive asteroid will hit the earth in September 2015 is a Hoax.
The NASA Jet Propulsion Laboratory (JPL) operates the Near-Earth Object Program to identify asteroids that come within millions of miles of earth. The JPL has taken to Twitter to dismiss claims that a massive asteroid will strike earth in September 2015:
“ The September asteroid scare is just another hoax.”
“The claims an asteroid scheduled to hit earth in September are a hoax.”
These claims appear to have started with the Rev. Efrain Rodriguez, a Pentecostal Evangelical minister from Puerto Rico. Rodriguez claimed that god told him an asteroid would strike off the coast of Puerto Rico and cause 40 million deaths. Aside from Rodriguez’s personal account, there’s no proof that an asteroid is on course to strike earth in September 2015.
These claims were echoed by a number of blog sites and went viral with a YouTube video that had more than 430,000 views. But the video appears to be nothing more than an advertisement for a book about the rapture and doesn’t include any details about the so-called asteroid bound for Earth.
Because there is no scientific proof that an asteroid will hit the Earth in September 2015, and because NASA has directly denied those claims, we’re classifying this one as fiction.
Collected on: 05/29/2015
Source….. http://www.truthorfiction.com and http://www.youtube.com
Natarajan
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The High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter acquired this closeup image of a “fresh” (on a geological scale, though quite old on a human scale) impact crater in the Sirenum Fossae region of Mars on March 30, 2015.
This impact crater appears relatively recent as it has a sharp rim and well-preserved ejecta. The steep inner slopes are carved by gullies and include possible recurring slope lineae on the equator-facing slopes. Fresh craters often have steep, active slopes, so the HiRISE team is monitoring this crater for changes over time. The bedrock lithology is also diverse. The crater is a little more than 1-kilometer wide.
The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project and Mars Science Laboratory Project for NASA’s Science Mission Directorate, Washington.
Image Credit: NASA/JPL/University of Arizona
Caption: Alfred McEwen
Source…www.nasa.gov
natarajan
Will the Oceans Soon Be Clean?Every year, over 8 million tons of plastic trash gets dumped into the ocean. The trash is not only unsightly, but also a serious hazard to marine life. Animals get stuck in bags and other bits of plastic; others try to eat the garbage thinking it’s food, and many end up hurt or worse. This information may cause one to ask if this is the legacy we’re leaving for future generations.
Knowing this, Boyan Slat – a 20-year-old man from the Netherlands, has been trying to find a solution. Finally, he came up with an ingenious way that will allow the ocean to clean itself (with a little help).
The plan is to set up specially-designed floating barriers in key locations around the globe. These locations are gyres – large system of circular ocean currents that are formed by global winds and the Earth’s rotation. The gyres circulate the ocean water around the Earth, making them the ideal location to trap all of the garbage.
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