Eastern pipistrelle bat 



Ejohn M Burnley. The National Audubon Sociely Collection'PR 



Banded Indiana bat study in Fogelpole Cave, Monroe County, Illi- 

 nois. J E GarOner 



14 



Indiana bat. j e Gardner 



myotine species hy its small overall size and longer ears. 

 Apparently distributed throughout Illinois during sum- 

 mer, Keen's bats have been found roosting in buildings 

 and trees and occasionally beneath bridges. Males can 

 be trapped almost anytime during summer at several 

 cave and mine entrances in Illinois. Winter is spent 

 hibernating in the colder areas of mines and caves. 

 Individuals seem to favor crevices and other tight 

 places as roosting spots and so are often overlooked. 



Females bear a single pup, but almost nothing is 

 known concerning the location or size of nursery ct>l- 

 onies. One colony of 1 5 pregnant Keen's bats was dis- 

 covered beneath the bark of a dead elm tree in Pike 

 County, Illinois, after a male Indiana bat was radio- 

 tracked to the tree. 



Big Brown Bat, Eptesicusfuscus. The big brown bat is 

 a large, brown, rather nondescript bat. Weighing from 

 Vi to Vs ounces, it is second in size only to the hoary bat. 

 One of the most common bats in Illinois year-round, it 

 is frequently found in houses, occupied or unoccupied. 

 Since this species has become tolerant of people and 

 benefits from their dwellings, it is the most likely spe- 

 cies to occur within urban areas. It has the distinctive 

 habit of snarling when frightened or disturbed in its 

 roost. An efficient feeder, a big brown bat is capable of 

 filling its stomach with insects in one hour. 



This species often shares maternity quarters with 

 other species of "house bats." Favored summer roosts 

 are attics, between walls, and beneath loose siding or 



