SOME HABITS AND SENSORY ADAPTATIONS OF 

 CAVE-INHABITING BATS.^ 



WALTER LOUIS HAHN. 



PAGE. 



Introduction •'^ 



Scope of the Paper '3" 



Previous Work 3 



Morphological Peculiarities '37 



Principal Adaptations for Flight '37 



Other Structural Peculiarities '37 



The Species Studied '39 



Physical Environment 39 



Dwelling Places '4' 



Selection of a Spot within the Cave '44 



Enemies 4 



Periods of Activity and Rest '4° 



Seasonal Activity '4 



Relation of Torpor to Season and to Nutrition 14^ 



Daily Movements '5' 



Feeding Habits '53 



Nature of Food 53 



Perception of Food 54 



Drinking 57 



Locomotion 57 



Mode of Progression '5° 



Agility in the Air '59 



Alighting '59 



Breeding Habits '^° 



Time of Mating '^° 



Period of Gestation '^^ 



Behavior in Captivity '3 



Feeding '^3 



Tendency to Explore ^^4 



General Introduction. 



The present paper embodies the results of about two years of 



observation on the habits of bats in caves and in the laboratory. 



The subjects to which special attention has been paid are : The 



choice of a dwelling ; the factors determining times of activity 



•Contribution from the Zoological Laboratory of Indiana University, No. 95, 

 being a thesis accepted as in part fulfilling the requirements for the degree of Doctor 

 of Philosophy. 



