[DoctorBeaver (OP)]

There's a certain type of flatfish (plaice?), 1 of the eyes of which goes for a walk around the fish's head. It starts off in 1 place and moves to another. How does that happen? Is it actually the eye moving or the head becoming deformed that gives the appearance that the eye is moving?

Secondly, some fish (and some cetaceans) can dive to incredible depths. Why doesn't the sea pressure flatten them? Is their internal pressure variable?

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[ROBERT]

Originally posted by DoctorBeaver

 Is their internal pressure variable?

Yes, they have a gas bladder:-
http://en.wikipedia.org/wiki/Swim_bladder

[DoctorBeaver (OP)]

quote:Originally posted by ROBERT

Originally posted by DoctorBeaver

 Is their internal pressure variable?

Yes, they have a gas bladder:-
http://en.wikipedia.org/wiki/Swim_bladder

SO have I after a good curry! []

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