Big Sting Ray
 

http://www.wptv.com/content/chopper5/default.aspx#top
Big ray off FL beach.
Caption says sharks following but they are probably Cobia.
I've caught some big Cobia that were following Mantas.
That sting rays looks as big as a manta.
I use to see 20 ft mantas off Caladesi Island near Clearwater as a kid
about 40 yrs. ago.