Ultrasound Diagnosis of Bat Pregnancy in Field Settings

Accurately documenting reproductive status is prerequisite for effectively monitoring wildlife population trends, population stability, and species-specific conservation objectives. Unfortunately, the accepted methods for determining reproductive status of North American bats can be subjective, and accuracy is influenced by experience of the handler. For small mammals other than bats, ultrasound can provide a reliable method for determining pregnancy. Our goal was to determine the efficacy of using ultrasound relative to abdominal palpation typically used by biologists to determine pregnancy in bats in the field. Although there are some advantages of using ultrasound in the field, this method did not outperform abdominal palpation substantively to warrant its expense.