Ambopteryx is a dinosaur confirmed to appear in Additional Creatures: Endemics.
Ambopteryx, meaning "Both Wing", is a species of small coelurosaur dinosaur that lived in China during the Late Jurassic, 160 million years ago. A close relative of Yi qi, it is the second species of dinosaur confirmed to have membranous wings. This questions if this trait is more widespread in the scansoriopterygids, the group of bird-like dinosaurs that they are a part of.
Ambopteryx is currently planned to be added in Additional Creatures: Endemics, with its design being known in concept art. This is updated from the design in the now-scrapped Additional Creatures: Ambients, having more bat-like wings and multiple feathery 'tails'.