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230 mya First to have advanced metatarsal ankle that allowed the Ornithodira to have multiple bones in its ankle to enable it to be more agile.
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200 mya Evolved a third sacral vertebrae making the Dinosauria more flexible in order to be more dexterous when running and turning Also aquired a reduced fibula that reduced its weight and move quicker.
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200 mya Small lizard-like dinosaur that showed the decreasing size from the original dinosaurs to modern birds.
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120 mya First known presence of feathers. Led to more development of aerodynamic navigational properties
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75 mya Bird-like rib cage that keeps rigid to allow solid body whilst moving. Smaller bodies that allow more agile movement and possibly flight
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Considered the "first bird" - 150 mya First organism to have feathers and fly, first "bird." More complex than ancestors, led to smaller, modern birds.
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Birds with feathers, hollow bones, wings, small bodies, flying organisms
