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When bison still roamed the North American Prairie, they existed in huge herds that migrated across the plains and grazed the grass to the ground, thus exposing grasshoppers, crickets and other herbivorous insects. Birds like the Cowbird followed these bison herds preying upon the herbivorous insects that the bison stirred up. In order to follow these bison, cowbirds laid their eggs in other bird species' nests, letting these host birds raise their offspring. The relationship of cowbirds to other birds is an example of: (select all that apply)

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