The only flying mammal, it has such thin, weak legs that it is hard to stand. Hanging upside down from a tree branch is easier. It is also easier to take off flying from that position.
Many people think it is blind, but it sees about as well as a human being.
Some of these creatures have trouble seeing at night, though, and find their way by the sound of their voices echoing off things they pass. Radley teaches English at Stetson University, DeLand Florida and frequently speaks at both schools and conferences.