Aphids created this cottonwood petiole gall. Looking at a gall hole’s shape and size, can tell you if the insect escaped or became food. What do you think happened? Photo by Mara Koenig/USFWS.

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Photo credit: © Natural History Collection / Alamy / Afripics
License: Licensed
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Keywords: animal, animals, archive, conservation, conserve, cottonwood, education, fall, fauna, fish, flora, forest, gall, habitat, history, image, leaf, learning, leaves, management, minnesota, mn, natural, nature, photo, preservation, preserve, record, reference, service, states, tree, trees, united, usfws, wildlife, world