The file animals.c, created by John Gennari, contains functions that output
structured instances denoting different types of animals.  The animals are
described by a set of cylinders, ala Marr.  

You don't receive the same animal each time.  Instead, their cylinder sizings
vary according to a Gaussian distribution with parameterized mean.  These means
distinguish the animals from each other.  

David Aha

From John Gennari:
	The only notes I have about it is that I don't use the data format
   it creates any more. To change this, modify "printpart()". Also, it uses a
   very rough approximation for a bell-shaped distribution. Currently, I use
   a much more sophisticated random number generator. To fix this, just
   replace "bellrand()" with a real bell shaped distribution.

	Everything else should be straightforward.