Assertion: bat's hind leg | /r/HasProperty | underdeveloped
Facets:
Source sentences:
text: Their wings don't produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can't run to build up the necessary takeoff speed.
text: Their wings don't produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can't run to build up the necessary takeoff speed.