entirely new, extinct creature that once roamed a long-lost ecosystem

Imagine an entirely new, extinct creature that once roamed a long-lost ecosystem. Its body is a blend of reptilian and avian features, with iridescent, feathered scales that shimmer in shades of deep emerald and gold. The creature has the sleek, muscular build of a predator, but with large, wing-like fins that extend from its shoulders, allowing it to glide through ancient forests and jungles. Its head is elongated with sharp, forward-curving horns and wide, compound eyes that give it an almost alien appearance. Rows of bioluminescent markings trace its spine, glowing softly in the twilight. Its tail is long and whip-like, ending in a cluster of spiny, fern-like appendages that it used to communicate or ward off rivals. The environment around it is lush and dense, with towering ferns and strange, oversized mushrooms, hinting at an ecosystem far removed from our own — one that could never exist today but once thrived in a forgotten age