In the roots site, I saw "bat-" as root for manta ray,sting ray,etc. The shape of a bat and the shape of a ray are a
bit similar. So I tried to look up etymology of "bat" and got "Not Found". But I found a site with the name for "bat"
in a couple dozen languages. I think many members will
find it interesting.It is much to long to post in toto.

http://66.218.71.225/search/cache?p=etymology+bat&ei=UTF-8&cop=mss&url=CkuooynnpuIJ:momiji.arts-dlll.yorku.ca/johnd/Aca/bats.rtf