Izawwlgood wrote:btilly wrote:Note that the top of the tail is
consistently larger than the bottom. That is to provide the
extra downwards push which is needed to keep them from sinking.
Erm, citation needed on that point. I linked to a picture that
shows you diagrams of what various shark tails look like. Click
on that link, and look at the picture and you have your
citation. Finding additional verification is as simple as
http://images.google.com/images?client= ... a=N&tab=wi.
Izawwlgood wrote:It's my understanding that a DOWNWARD push will
push you DOWN, making you sink. And it is also my understanding
that sharks are neutrally buoyant. I could be wrong. Repeat
after me, For every action there is an equal and opposite
reaction. If you push down, you are pushed up. Izawwlgood
wrote:Aha!Locomotion and buoyancy Sharks swim by moving their
caudal fin from side to side in a sweeping motion, which propels
them forward through the water. The large upper lobe of the
caudal fin of most sharks provides most of the f