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2024 අඩුම මිලකට මිලදී ගත හැකි හොදම කුරුල්ලන් වර්ග 10 ක් | bird price in sri lanka 2024 | cockatiel
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Birds are a group of warm-blooded vertebrates belonging to the class Aves /eɪviːz/, characterized by feathers, toothless beaks, hard-shelled egg-laying, a high metabolic rate, a four-chambered heart, and a strong but light skeleton. The birds live around the world and range in size from the 5.5 cm (2.2 in) hummingbird to the 2.8 m (9 ft 9 in) ostrich.
There are about ten thousand species, more than half of which are passerines or "perchin" birds. Birds have wings and their development varies according to the species; The only known groups without wings are the extinct moa and elephant birds. Although further evolution has led to the loss of flight in some birds, including rats, penguins, and various endemic island species, winged birds have been given the ability to fly.
Birds' digestive and respiratory systems are also uniquely adapted for flight. In some aquatic environments, especially seabirds and some waterfowl have further evolved to swim.
Birds are a group of feathered theropod dinosaurs and are the only living dinosaurs. Similarly, birds are considered reptiles in the modern cladistic sense and their closest relatives are crocodiles. Birds are the descendants of primitive avians that appeared in China about 160 million years ago (mya). According to DNA evidence, modern birds (Neornitus) evolved in the mid to late Cretaceous and diversified dramatically during the Cretaceous-Paleogene extinction event 66 mya.
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Негізгі бет 2024 අඩුම මිලකට මිලදී ගත හැකි හොදම කුරුල්ලන් වර්ග 10 ක් | bird price in sri lanka 2024 | cockatiel
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