Date of Award


Degree Type


Degree Name

Master of Science in Zoology



First Advisor

H. E. Winn


Twelve sound types, spectrographically analyzed from recordings of captive and wild grey seals (Halichoerus grypus), included continuous and pulsed sounds. All continuous sounds showed sub-harmonic energy, and emphasized frequencies between 100 and 800 Hz. Click type sounds had energy to greater than 60 kHz, and were repeated at rates up to 1500/sec.

A behavioral significance is hypothesized for most sounds.



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