The BBC has incredible ultrasound footage of an Atlantic bottlenose dolphin. This little guy has since been born and lives at Discovery Cove in Florida:
[H/T Holly]
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July 21st, 2009 at 11:13 am
Interesting and fascinating to observe.
July 21st, 2009 at 11:31 am
Is the frequency of an ultrasound imager within the perception range of a dolphin? You have to wonder what the mother and fetus are thinking about all that racket? “Hey, stop all that cussing!”
July 21st, 2009 at 5:53 pm
@2: Diagnostic ultrasound is usually in the 2-20 MHz range, which should be safely outside any animals perception range (german wikipedia gives 0.22MHz for dolphins). OTOH, a gynecologist told me that dogs in the neighbourhood always start barking if she performed ultrasonographies – maybe the the signal contains subharmonics (or higher harmonics of the pulse modulation frequency, which is a few kHz).