I'll call back later http://ducksyouthfootball.com/prescriptiondrugstorecom-7696.pdf flugmed.org  Sayigh added that scientists still aren’t sure how dolphins create their signature whistles, although recent research has suggested that learning is involved. The diversity of whistles among relatives indicates that they probably aren’t encoded in DNA. Also, about 30% of the male calves Sayigh and her group have observed emitted whistles similar to those of their mothers, suggesting that they model them after whistles they’ve already heard.