Check out Habu on the web and you'll find a bunch of references to the small, highly poisonous snake found in Okinawa, where a number of SR-71's were stationed. Habu.org has a lot of info and pictures of the plane.
"When the A-12s (and later the SR-71s) were first flown to their new remote base at Kadena AFB in Okinawa, the local people thought that this strange and somewhat wicked-looking airplane was shaped like the habu snake. They started calling it the habu airplane, and later just habu. Crews who flew the airplane were also called Habu, and the name came to be recognized with the blackbird program and even incorporated into the insignia worn by the crews on their uniforms. ", from habu.org.
There are a number of planes that have images of the snake on them and there a lot of images and lore about the plane on various websites, its worth a google search.
Ken