Some reptiles can glide.
https://www.semanticscholar.org/paper/Gliding-and-the-Functional-Origins-of-Flight%3A-or-Dudley-Byrnes/e50cdee830224c46d7519ff0addd34dc999d0cf1
Unsteady glide with a highly-maneuverable membrane. [1]
Short, steep drop followed by flattened out glide.
Glide angle: ~30 [deg]
Aspect Ratio: ~1.7
[1]