Subject: Do sharks attack carniverous, toothed, whales?

I saw on a science movie that sharks attack baleen whales.  Do they attack 
orcas or sperm whales?  I have no immediate need to know this but I am curious 
and no one I talk to seems to know or care.  Also, why could not sound signals 
be used to separate porpoises from tuna to prevent porpoises from being 
netted.  I offered this suggestion to Greenpeace when they sent me a plea for 
money and got no response.  Does a non response mean that the idea is stupid?

Re: Do sharks attack carniverous, toothed, whales?