Here Fishy, Fishy, Fishy.

So here is an interesting article. Killer Whales not only have a favourite fish but they also have a method of finding them when they're scarce. Killer whales off the coast of BC and Washington state apparently prefer chinook salmon since they have a higher concentration of fat then other salmon species. But how do they find this particular salmon amongst all the other fish in the region? Well they use their own knid of natural sonar device, echolocation, yes, like a bat. But instead of size being the determinent factor in selecting prey, it's the swim bladder that influences the decision. The researchers found that "each salmon species has a unique echo pattern based on the different sizes and shapes of their swim bladders." So that is how the killer whale can distinguish its favourite food. The theory is still in the testing stages but, the researchers are optimistic that it will be proven true.