To visually access the fetuses, we scanned the pregnant subjects using a SIUI-CTS-8800+ portable ultrasound (Shantou Institute of Ultrasonic Instruments Co., Ltd., Guangdong, China) equipped with a L7L50K-G Linear 5-12 MHZ probe set at a frequency of 7.5MHz, 60dB in gain, and resolution depth of 3.2 cm. In 2015, parturition dates were recorded for females (n = 7) housed in the laboratory. Because females captured in 2018 were released at their capture sites following the ultrasound procedure, parturition dates for these females are not known. However, all females tested in 2018 were deemed to be late term based on the ultrasound results.