why do most creatures have one head?

Question

i thought they would be twice as smart

Answer 1

If not satisfied, you can make artificial one or more heads and stick to your body and be the special creature. In case you want to enter guiness book of world records, you will have to make 10 artificial heads to beet Ravana (who had 10 heads).

Answer 2

That's actually a good question - the best answer I can give you is that from a very early period life seems to have settled on a body plan that features either no 'head' (radial animals like starfish, for instance) or one head (linear animals). Why not two heads? Well, it may be that heads are expensive to make and maintain; certainly brains are. If there's no great advantage to having 2 heads, you wouldn't expect such a feature to be widespread. Occasionally an animal is born with 2 heads due to a developmental glitch, but they don't usually do too well, even if they can survive for a while in captivity. Whether that's due to other developmental problems or to the 2-head situation itself, I can't say.

Answer 3

Control of the rest of the body would be under constant contradiction. In parallel, in terms of electricronics, an AND logic gate would be a good example of this situation. The decisions of two heads would be 25% effective if simultaneous control occurs... a huge disadvantage for two-headed life forms.

Control decisions example:
UPPERCASE = head 1, lowercase = head 2
YESyes = yes
NOno = no
NOyes = no
YESno = no

However asynchronous control of separate parts could actually result in above normal effectiveness E.G. in computing: multi-core processing.

:)

Answer 4

Because the head houses the brain and a creature with two brains would be in a terrible condition, what if one brain wanted to go right and the other wanted to go left? the poor animal would rip itself apart.

Answer 5

evolutionarily speaking, it would be to costly in terms of energy to support two heads. as many functions vital to survival rely on the central nervous system to make decisions. having two heads would require twice the energy, and probably a split in decision making which would cause a slight pause in reaction, which could cost an organism its life, by not reacting quick enough.

Answer 6

According to Warcraft. Ogres having two heads are dumber because they would contradict each other.

Think what would happen if one heads want to go left and the other right.

Answer 7

Could be Mother Nature's way of preventing any more arguments and wars than the one-headed ones have presented already.

Answer 8

It has to do with the theory of sexual selection.
Would you marry a woman with two heads? Nagging in stereo.

Actually, having two heads, and hence two brains, is inefficient, the brain chews up a lot of energy, having it all in one spot reduces energy consumption and heat loss.

Answer 9

have you ever been in two minds about something? imagine, if creatures had multiple heads, and each could think independently from the other... whoa!

Answer 10

most likely because it is an disadvantage to have more than one head. creatures with more than one head died because of this disadvantage.