sergio candido de oliveira junior sergiounesp@ig.com.br for those working with marine mammal behavior: is there some way to apply chronobiological analysis in behavior studies of cetaceans in wild environment ? any body works like that in behavior analysis of cetaceans ? the difficult of the studies on natural environment probably brings a lot of impossibilities at observation that , in turn , brake the continuum status on data. however different technics on methodological observation can brings a framework to make possible that occur. I´ve been searched information about that in http://www.portaldapesquisa.com.br, a brazilian data bank of cientific papers around the world. otherwise, I´ve been seached in scientific books generals. I wait for any kind of opinion or suggestion in this subject. cheers.