Mosquitoes and other insects, however, provide a vital part of the food web for larger predators such as this frog in a bog in Maynard, Massachusetts. As in most wetlands, frogs are sentinel species, indicators of the health of a bog.

Photograph by Rachel Castagnino, My Shot
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bog
bog Encyclopedic Entry

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A bog is a wetland of soft, spongy ground consisting mainly of partially decayed plant matter called peat