Top 15 Largest Living Bird Species

Birds form one of six basic animal groups, with the others being amphibians, fish, invertebrates, mammals and reptiles. They are endothermic vertebrates, characterized by feathers, toothless beaked jaws, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. They reproduce by laying of hard-shelled eggs (eggs fertilize inside the female). The fossil record indicates that birds are the last surviving group of dinosaurs. So, they are also termed avian dinosaurs.

Birds (Aves) range in size and weight from the 5 cm (2 in) and 1.6-2 grams bee hummingbird to the 2.75 m (9 ft) and 104-156 kg (229-344 lbs) ostrich. Here are the top 15 largest (by body weight) living bird species.
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8 Famous Places to See Before They Are Vanished

There are a lot of natural and human-made wonders in the world. But everything has an end, and sooner or later, they’ll be gone. Unfortunately, some of them will be vanished sooner, even in a few decades. Here are eight of them, just in case you may want to see before they are gone.
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Gator Uses Bait Stick to Catch Egrets (Video)

An alligator’s brain weighs only 8 or 9 grams, and it has the size of a walnut, but that don’t mean they are stupid. In fact, they’re much smarter than you’d think. In Everglades National Park in the United States, a 400-pound (181 kg) gator displays a clever way and uses a bait branch stick to catch egrets during breeding season.
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Planet Earth II Official Extended Trailer

In 2006, Planet Earth, the British television series produced by the BBC Natural History Unit “has changed our view of the world”. It was the first nature documentary series filmed in high definition. It took five years in the making and it was the most expensive nature documentary series ever commissioned by the BBC. Now, ten years later, in February 2016, the BBC announced a six-part sequel had been commissioned, titled Planet Earth II. On October 2016, BBC released the new series’ trailer.
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How Mars would look if it still had water

What if Mars still had liquid water on its surface and a thick atmosphere filled with clouds, like Earth? How would it look like? Software engineer Kevin Gill of JPL (NASA’s Jet Propulsion Laboratory) wondered this and prepared an image using data from NASA’s Mars Reconnaissance Orbiter (MRO)(1) and Mars Orbiter Laser Altimeter (MOLA)(2). The result is stunning!
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