We report on observations of parturition and maternal behavior of Corynorhinus rafinesquii (Rafinesque's Big-eared Bat) at a bridge in west-central Mississippi. Rafinesque's Big-eared Bats formed a maternity colony beneath the bridge in March, and parturition occurred from late May to early June. On 28 May 2004, a female Rafinesque's Big-eared Bat was observed giving birth in the breech position, which has not been previously reported for the species. On the same day, another adult female and her pup were found struggling on the ground due to entanglement of the umbilical cord around the mother's wing, and a third female was observed biting her pup. While important data were obtained during our observations, we emphasize the necessity of using extreme care when conducting repeated surveys at maternity roost sites.