Ethology  is  the  study of animal
   behavior, the response of an animal to a stimulus.
<P>
   The  proximate("how")  causation  for  the  courtship  dance  of Asian
   red-crowned cranes may be rising hormones in late spring.
<P>
   The  ultimate  ("why")  causation  for  spring mating rituals may be a
   higher  likelihood  of  survival  for  offspring  since  food  is more
   plentiful in summer.
<P>
   Albatross courtship:  <A ClAsS=MID Href="../../../med/Vid/Campbell7e/AlbatrossCourtship-V.swf" oNClick="popurlt('../../../../med/Vid/Campbell7e/AlbatrossCourtship-V.swf');txtcolor('cranes1','gray');return false;" Id=cranes1><iMg sRc="/images/shockwave.gif" aLt='' boRDer=0></A>