Winged creatures are a gathering of endothermic vertebrates, portrayed by quills, toothless angled jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a solid yet lightweight skeleton
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From @ashusgd1
Winged creatures are a gathering of endothermic vertebrates, portrayed by quills, toothless angled jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a solid yet lightweight skeleton