Today I visited the aquarium in Otaru,Hokkaido,Japan.They had a
female walrus in a large glass walled cage.The walrus kept repeating
the same call(audible through the glass),the first part a high
pitched varying screech,the second a periodic lower pitched tone and
finally a very low frequency single drone(this could be felt directly
through the glass).The last part reminded me of running a 20hz sine
tone through my speakers(not that they can reproduce it
accurately!!).Does anyone know how low a walrus call goes?I thought
this might tie in with the infrasound discussion.How about
alternative calls?I know nothing of sea mammal calls so any
information would be of great interest.A lurker,Richard,Sapporo,Japan.
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