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Birds

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New Four‑Winged Microraptorine Jian changmaensis Described From China’s Changma Basin

A partial shoulder and forelimb suggest a gliding four‑winged predator that extends confirmed microraptorine fossils into northwestern China.

Archaeopteryx Fossil Reveals Bird-Like Mouth Features Linked to Flight Demands

Dinosaur Speeds Overestimated by Up to Fivefold on Muddy Tracks