Jacob writes...

I've got a few questions about the wings of a garg:

1) Are there bones inside the wings? Or instead of bones cartilage? Or anything else?

2a) If the answer to 1) is the former, does it mean then that the wings are something like a second pair of arms?
b) But that doesn't seem to be right, because nothing on the wings looks unflexible, in especially when they are "not in use" and laid round the body, or have I just not looked carefully enough to notice anything else?

3) Their wings don't seem to be very thin and light, but more thick and heavy. Is this to prevent major damages like a big hole? Has it any other advantages?

(BTW: How's my English? Because I'm not sure that everything is understandable)