Ammonites have a flat spiral shell which is composed of different rooms. Each time the animal is too large for the current chamber is formed a new larger outer chamber. In this outer chamber the animal's glass candy dishes life, that the other empty rooms further used as a means to move vertically. Ammonite separates gas from these rooms so as to control the lift force on the shell. The ammonites of size ranging from less than an inch to more than 2.5 meters in diameter. This fossil I bought at Nature Museum Nijmegen.
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