The whales I never knew were there

Whale carcass may be towed out to sea to save pod | Environment | guardian.co.uk

The story is about some stranded killer whales up at Fraser Island, and ends with this:

Killer whales, also known as orca, follow the humpback whale migration along Australia's east coast to prey on calves.

I didn't know that.  Obviously, their tastes don't run to humans all that much, as I have never heard of an orca being seen anywhere near a beach on the Gold or Sunshine Coast as they pass on their way to or from Hervey Bay. 

I actually assumed they always stayed in colder waters.  My knowledge of marine biology is obviously lacking.