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It use to run on ground, so why is it considered as a bird?
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How peculiar it is to think of an ostrich as a bird when it can't fly! It seems like an oxymoron, that this large and majestic creature is part of a species known for their ability to soar the sky yet is physically incapable of doing so itself. Despite its inability to take flight, the ostrich is still incredibly fast and agile, running as fast as 70 km/h and effortlessly navigating through different terrains. Perhaps not taking to the air gives it a greater appreciation of the earth beneath its feet. The ostrich is one of a kind, proving that flight isn't always the best way to experience the world.

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They're classified as birds due to their fore limbs reduced to wings. And the reason they can't fly is that their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight.
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Thanks for the information, i never knew that was the reason they could not fly.
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Some things we can never explain in our own thinking but I must say that's the power of nature. That's how they were created. 
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The flat breastbones of Ostrich lack the keel that anchors the strong pectoral muscles required for flight. 

Ostrich is a heavy bird, their wings cannot lift their heavy bodies. Hence they cannot fly. 
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Normally in birds the wings consist of pneumatic bones( bones that are filled with air) to reduce the weight of birds which makes them easy to fly. But in ostrich the breast bone doesn't consist of keel bone which attaches pectoral muscles.so the body becomes heavy and the wings can't lift the heavy body
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They are birds because of their feathers. They also lay eggs and do such things as a bird but they cannot fly. Their wings cannot lift their body because it is heavy but that's why they run faster
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Ostrich is considered a bird because it has most characteristics of being a bird like feathers, it lays eggs, it is also two-legged animals. It cannot fly basically because of its weight and it has small wings. Also, imagine if ostrich can fly, wouldn't you be terrified? 
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They belong to a family of birds that cannot fly, they may use their wings as rudders to help them change direction while running. Their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. They can sprint up to 43 miles an hour and run over a distance at 31 miles an hour. 
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Ostriches, emus, cassowaries, rheas, and kiwis can't fly. Unlike most birds, their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. Their puny wings can't possibly lift their heavy bodies off the ground.
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They are birds due to the fact that they have feathers and wings. They also lay eggs. Their eggs are the biggest in the world.
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Unlike other birds ostrich flat breastbone lack the keel that anchors stroy pectoral muscle required to flight, their puny wings can not  possibly their heavy bodies from the ground 
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Ostriches are flightless birds due to their heavy bodies and small wings, but they are still classified as birds based on other anatomical and genetic features.
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The ostrich is a remarkable bird, and it is the largest and heaviest living bird species in the world. Unfortunately, the ostrich can't fly due to its anatomy. Its long legs and bulky body make it top heavy and difficult to maintain altitude. The ostrich's wings are much too small and weak to lift its massive weight, so the bird uses its legs to run up to 40 mph on the ground to stay safe from predators. As a result, the ostrich has adapted to life on the ground, taking advantage of its long legs and superior running speed to outrun danger. The ostrich is truly a remarkable bird, despite not being able to take to the skies.
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Yes, the ostrich is a bird even though it cannot fly. Flightlessness is a trait shared by several species of birds, including the ostrich, emu, kiwi, and penguin.

While the ostrich cannot fly, it is a skilled runner and can reach speeds of up to 70 km/h (43 mph), making it the fastest bird on land. The ostrich's powerful legs are adapted for running, with two toes on each foot, and can cover long distances without tiring.

Despite their inability to fly, ostriches have other adaptations that make them well-suited for their environment. For example, their wings are used for balance and to help them change direction while running, and their long necks allow them to scan their surroundings for predators.
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Unlike most birds, their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. Their puny wings can't possibly lift their heavy bodies off the ground. These flightless birds, called ratites, are clearly different from other avian species.
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ostrich is flightless and instead is built for running. With its powerful legs, the ostrich can sprint in short bursts up to 43 mph (70 kph), and can maintain a steady speed of 31 mph (50 kph).
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