00503naa a2200193 a 450000100080000000500110000800800410001910000170006024500840007726000090016165300080017065300090017865300150018765300140020265300130021670000160022970000190024577300450026418027792017-04-18       1974    bl ---       0--  u    #d1 aKREBS, J. R.  aHunting by expectation or optimal foraging? A study of patch use by chickadees.  c1974  aAve  aBird  aChickadees  aPreadator  aPredacao1 aRYAN, J. C.1 aCHARNOV, E. L.  tAnimal Behaviourgv.22, p.953-964, 1974.