Tick birds keep the skin of rhinoceros clean by eating the ticks and insects that settle in the folds.
Iced bugs
Iced bugs Colonies of bacteria live underneath glaciers,
where they produce gas which erodes the rock under the glaciers.
Researchers believe that this may account for the large amounts of
carbon dioxide found underneath the Greenland ice sheet. 6 FEBRUARY 1999, P. 25
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