Answers are grounded in this paper and cite their sources.
G. N. Rysgaard, A Study of the Cave Bats of Minnesota with Especial Reference to the Large Brown Bat, Eptesicus fuscus fuscus (Beauvois), The American Midland Naturalist, Vol. 28, No. 1 (Jul., 1942), pp. 245-267
No takes yet. Share an insight, caveat, or question.
G. N. Rysgaard (1942) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: