Is there any evolutionary reason for Hammer Head Sharks’ heads to be shaped like that? You know, like a giraffe has a long neck so it can reach leaves that are high up.
There are only evolutionary reasons for the sharks’ shape. You mean is there an adaptive advantage to having such a funny looking head, and as to that I can’t exactly say. Two speculations which I’ve heard:
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Having the eyes on the ends of horizontal ‘stalks’ gives the shark a better view, when it turns it’s head, of what is behind and in front of it. In short, it gives a wider field of view.
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The head ‘stalks’ act a bit like diving planes and thus somehow help the fish swim.
I’m skeptical though. Are either of these really helpful? Maybe the morphology just isn’t a hindrance.
Is there an icthyologist in the house??
From this article.
I hope the last word in that quote isn’t (sic), otherwise I wouldn’t rely on that article too much 
Why the Hammerhead Shark’s head is in the shape it’s in:
The site goes on to summarize three studies testing various of the mentioned hypotheses.
That’s the English spelling. Notice it’s a UK site.
Hammerheads are demonstrably much more maneuverable in tight spaces than most sharks; having a “hydrofoil” shape at the front of the body is believed to be a major contributing factor in this. (Sorry, no cite; it’s from reading of about a year ago.)
Also note: Evolution doesn’t do what is best. It does what works.
This is one heck of a thing to reference, but one of my sons’ National Geographic videos has footage of a hammerhead feeding. Unlike a “typical” shark attack (i.e., where a shark makes one killing strike then backs off until the prey is dead), the hammerhead was chasing a fish along the sea floor, weaving back and forth in quick, tight turns until the other fish made the wrong turn. It seemed obvious that the broad head gave the shark a better sense of its direct surroundings. It also looked to me as if having more shark swinging around over the prey may have kept the prey on the bottom.
More accurately, evolution doesn’t do a damn thing if a mutation or physical formation does no harm. If it doesn’t detract from the ability to leave lots of offspring, then evolution simply won’t affect it.
Hmm… I was always told that the hammerhead had a bunch of sensors in its head which could detect electrical impulses given out when muscles in fish (or humans) move. Have I been misinformed?
That’s pretty much what Q.E.D.'s cite was saying. So, no, you haven’t been misinformed, just unobservant.