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Birds HD Wallpapers Images Pictures

Birds HD Wallpapers Images Pictures

To download Infinity no of Beautiful Birds HD Wallpaper Images Pictures free download available for iPhone, Android, Desktop, and Tablets @ http://wallpaperinfinity.com Birds HD Wallpapers Images Pictures

Birds HD Wallpapers Images Pictures

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Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

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Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

Birds HD Wallpapers Images Pictures - wallpaperinfinity.com

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Source – Birds HD Wallpapers Images Pictures

Birds are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. Bird live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching bird or, less accurately, as songbirds.

Bird live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching bird or, less accurately, as songbirds.

The fossil record and modern advances in “reverse evolution” genetic engineering indicates that birds are the last surviving dinosaurs, termed avian dinosaurs, having evolved from feathered ancestors within the theropod group of saurischian dinosaurs. True birds first appeared during the Cretaceous period, around 100 million years ago.

DNA-based evidence finds that bird diversified dramatically around the time of the Cretaceous-Paleogene extinction event that killed off all other dinosaurs. Bird in South America survived this event and then migrated to other parts of the world via multiple land bridges while diversifying during periods of global cooling.

Primitive bird-like dinosaurs that lie outside class Aves proper, in the broader group Avialae, have been found dating back to the mid-Jurassic period.

Many of these early “stem-bird”, such as Archaeopteryx, were not yet capable of fully powered flight, and many retained primitive characteristics like toothy jaws in place of beaks, and long bony tails.

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