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 bird species (by body weight).
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.
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Here are the top ten most powerful earthquakes (by the Moment magnitude scale, MMS; denoted as Mw or M) in recorded history, according to the United States Geological Survey (USGS), a scientific agency of the United States government.
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Since the Neolithic revolution, the humanity is building cities. Here are the top ten amazing facts about cities all around the world.
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Earth, the blue planet: the oceans combined with the atmosphere makes the planet look blue. So its color mainly comes from water. About 71% of the Earth’s surface is covered with water, in fact Earth is still the only planet we know where water can exist in liquid form on the surface. Water is also vital for all known forms of life. But there are numerous places on Earth that receive rainfall less than even 0.76 mm annually. One place even receive absolutely no rainfall. Here are the top ten driest places on Earth.
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The exact moment of the Calbuco Volcano eruption captured by a currently anonymous hiker in Chile. The volcano erupted on April 22, 2015, for the first time in four decades (the last one was in 1972).
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The Calbuco volcano in southern Chile has erupted twice and the people have been evacuated. It is the first eruption of the stratovolcano in 42 years; results in huge ash cloud over mountainous area in south of Chile.
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A unique friendship between a man and a crocodile: nicknamed “Chito”, Gilberto Shedden, a Costa Rican fisherman and naturalist has had an unusual friend: “Pocho”, the crocodile longer than 5 meters, with a weight up to half a ton.
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The age of the Earth is approximately 4.54 billion years. For all these years, our planet has been a work in progress: water, wind, air pressure, minerals, heat, and even extraterrestrial forces like meteors and comets mold and shape our environment, and created all manner of strange formations. Some of them are really beautiful: we call them “Natural wonders”. Some natural wonders are really famous, for example the Grand Canyon or Victoria Falls. Some of them are lesser known, yet still stunning. Here are the 10 lesser known natural wonders of the World.
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