>And just to confuse things more, I just remembered reading about cuttlefish, large enough to battle whales (though the whales apparently most always win).

Dr. Bill, I must disagree. An astrophysics grad student friend and I have spent *many* an hour discussing the relative advantages of giant squid in battle with blue whales, and we've come to the conclusion that the squid would win. See, even though the whales have the sonar thing going on, in addition to sheer bulk, the squid has both speed of mobility and suction power on its side. Not to mention one well-placed tentacle could bring on asphyxia in a matter of... what... hours? That's what they call The Achilles Blowhole.

Please send suggestions for alternative hobbies by PM. Obviously they're sorely needed.