Oxpecker and Bison

Bison

A bison is a big mammal that has a bad tick problems and lets birds pick them off of it.
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Oxpecker

The ox-pecker is a bird that goes around and eats ticks and fleas off of mammals.
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How a bison and ox-pecker help each other

A bison and ox-pecker help each other when the ox-pecker eats the ticks on the bison and gets a good meal from all of the ticks.
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