The following directions, originally posted to the balloon sculpting mailing list, can now be found in a more refined form in Twisting History - Lessons in Balloon Sculpting.
From  Mon Oct  5 21:31:07 1992
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From: (Larry Moss)
Date: Mon, 5 Oct 1992 21:33:48 -0400
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To: balloon
Subject: bat
The picture in PostScript or GIF. I wasn't very happy with not being able to reproduce the bat I made last year so I've got an all new one. Thanks to Judy for helping with this one. I've also finally gotten around to doing something I said I would do a long time ago. I actually drew this one (thanks again to Judy for straightening out my hideous math and fixing the macro that I used to do most of the drawing). The pictures are included at the end of this in encapsulated postscript. The instructions are straight text. I was originally going to make the whole thing a postscript document, but this was easier and this way anyone that can't view postscript for one reason or another can still give this a shot. In the future I hope to make most of my postings postscript, so please let me know now if that's a problem.

Enjoy --

The bat requires 2 balloons. Black works best. Leave about 4 or 5 inches uninflated in each balloon.

Start by making a 1-inch bubble followed by two 1/2-inch bubble. Twist the two small bubbles together (at points A and B on figure 1). This forms the head and two ears (figure 2).

Now make three 3-inch bubbles. Make a bird body out of them by twisting bubbles 1 and 2 together at points A and B. Then role the third bubble between them. (figures 3 and 4)

You now have the bat's body. The remainder of the balloon will be used to make the first wing. Make 4 bubbles with the sizes 10 inches, small (.5 to 1 inch), 3 inches, small. The fifth bubble in this chain should be between 5 and 6 inches (figure 5). If the remainder of the balloon is longer than that, twist off a fifth bubble. Twist either the tail of the balloon or the end of the last bubble you made around the neck (marked as point A on figure 5). If you had to twist bubble 5, deflate the remainder of the balloon. It should be held securely by the twist around the neck so only that last bubble will loose air. Wrap the tail around the neck enough to hide it (figure 6). Now ear twist the two small bubbles.

The second balloon is used for the second wing and the two legs. Twist the nozzle end of it around the neck (fig. 7). The second wing is just the reverse of the first. Make a 5- to 6-inch bubble, followed by a small bubble, a 3-inch bubble, another small one, and a 10-inch bubble. Twist at point A (figure 8). Again, ear twist the small bubbles.

Now make five bubbles to form the legs with a pop twist. That's 1 inch, small, 1 inch, small, inch. Just like above, you may be out of balloon at the end of that last bubble. That's fine. Do a locking twist (points A and B in fig. 8) or wrap the tail around point A to form the legs. Again deflate any remaining balloon. The deflated tail of the balloon will serve as the tail of the bat. Ear twist the two small bubbles connected to the legs and pop the larger bubble between them.