Reptile That Flattens Its Body to Glide in the Air

This page is the CodyCross answer for the clue below from Inside the Spaceship, Group 1185, Puzzle 3 (Planes and Air Travel).

Question is: Reptile That Flattens Its Body to Glide in the Air

and the answer is: TREESNAKE

Word Meaning:

TREE SNAKE — Any of various snakes of the genus Dendrelaphis.

Definitions from Wiktionary.