Topaz antiquities

are found round the throats
of penguins. Elsetimes they
swallow stones to either use
as ballast or to grind down
the shells of crabs. Always
they rattle when they move. 
Othertimes they cohabit with
seal-headed men which is
where the topaz comes from.
Cave paintings portray this,
carbon dating confirms the
antiquity of the paintings, 
the impurities of the back-
ground silicates give color to
the paintings. The penguins
have vanished from the caves,
the seal-headed men remain.