...is available in the July- August 2012 American Scientist including spectrograms of at least four different dialects for those interested in pursuing the topic further. The article it titled Vocal Matching in Animals by Kendra Sewall...The article also includes some interesting info on bat vocalizations. -- Brush Freeman Independent and affiliated Field Biologist 361-655-7641 http://texasnaturenotes.blogspot.com/ Finca Alacranes., Utley,Texas The greatest musician of all time is mother nature. Edit your Freelists account settings for TEXBIRDS at //www.freelists.org/list/texbirds Reposting of traffic from TEXBIRDS is prohibited without seeking permission from the List Owner