Re: Why are there few, or no, Orca attacks on humans?

You can't compare a shark to a killer whale! They're very very different 
animals; joined only because they both have a taste for seals!

Orcas rely on sight, hearing and an amazing intelligence to identify their 
prey. Orcas generally hunt in pods and often take dolphins and seals as 
the prey swims underwater. Killer Whale pods locate a group of dolphins or 
seals (or whatever else is available) and herd them into a bay to panic 
them. Then they have a number of different strategies available to them to 
select an individual prey item from the corralled group.

Sharks use their eyesight, smell and an electro sense to identify possible 
prey types. Sharks generally hunt alone and take advantage of prey 
opportunistically. That's probably why surfers are taken by prowling 
sharks.

Have a look at the following website: it's very informative for orca 
behaviour info. http://stubbs-island.com/english/whales/index.html

Hope this helps.

cheers,

Alastair