Social behavior of the little brown bat, Myotis lucifugus

@article{Thomas2004SocialBO,
  title={Social behavior of the little brown bat, Myotis lucifugus},
  author={Donald W. Thomas and M. Brock Fenton and Robert M. R. Barclay},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={6},
  pages={129-136}
}
Summary1.We studied the social and mating behavior of Myotis lucifugus at two hibernacula (Renfrew Mine and Tyendinaga Cave) in Ontario during the swarming and hibernation periods of 1976 and 1977.2.During July the population of bats arriving at the hibernacula consisted of adult males and nulliparous females, while in August and September subadults and post-partum females predominated.3.Inside the hibernacula bats often flew in pairs consisting of adult males following females, and transient… 
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References

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Social behavior of the little brown bat, Myotis lucifugus
TLDR
Behavioral observations indicate that despite the gregarious nature of the little brown bat, a simple social system exists and the small repertoire is therefore not surprising.
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Application of the general model cannot be simplified by measurement of a few variables such as body size or group size, but instead will generally require actual measurements of the critical resource dispersion parameters in the field.
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TLDR
The data suggest that a testosterone surge is required to stimulate the accessory glands fully, but lower levels of androgen are able to support them (as well as epididymal sperm and libido) during the breeding and hibernation seasons, however, these “lower” levels apparently are not sufficient to maintain the accessories when the bats emerge from hibernation in the spring.
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TLDR
The social calls of 14 Myotis lucifugus produced under controlled conditions were more variable than echolocation calls made by hunting individuals in the wild and may have possible significance in the context of recognition of individuals by their vocalizations.
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