This one came from the L.A. Reader via a circuitous route (saw it quoted
in New Scientist):
U.C. Davis graduate student Anne Perkins on her study of sexuality in
sheep:
"It is very difficult to look at the possibility of lesbian sheep
because if you are a female sheep, what
you do to solicit sex is to stand still. Maybe there is a female sheep
out there really wanting another
female, but there's just no way for us to know it."