[From Bruce Abbott (991201.1925 EST)]
A tidbit from my recent reading:
"We begin to realize now that the fact that an animal may use various
behaviour patterns in order to attain one special end does not necessarily
mean that this plastic behavior is not dependent on nervous mechanisms, but
that it might also, and certainly does, mean that the underlying nervous
mechanisms are much more complicated than was expected before."
[Niko Tinbergen (1950, p. 305)]