“…Prenatal sound exposure has been suggested to aid dolphin calves in whistle development (Tyack & Sayigh, 1997), and exposure to sound in utero appears to aid learning processes in humans (e.g., DeCasper & Fifer, 1980;Partanen, Kujala, Tervaniemi, & Huotilainen, 2013) and other nonhuman mammals (guinea pigs, Cavia porcellus, Vince, 1979;sheep, Ovis aries, Vince, Armitage, Walser, & Reader, 1982). If dolphin calves process sound in utero, exposure to the mother's signature whistle prior to birth may decrease the calf's fear response to the sound following birth, inciting the calf to follow the object with which it is already familiar (Van Kampen, 1996). Alternatively, dolphins may increase signature production when stressed (Esch et al, 2009), and mothers may be stressed or restless prior to labor (Mello & Amundin, 2005) as cortisol increases during gestation, peaking near delivery (Tizzi, Accorsi, & Azzali, 2010).…”