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OGNelson: Backswimmer (Family Notonectidae), Clam River, WI
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OGNelson: Tadpole Madtom (Noturus gyrinus), Wisconsin
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OGNelson: Tadpole Madtom (Noturus gyrinus), Wisconsin
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OGNelson: Tadpole Madtom (Noturus gyrinus), Wisconsin
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OGNelson: Clam River variety pack
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OGNelson: Dragonfly naiad (nymph), Clam River, WI
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OGNelson: Dragonfly naiad (nymph) on a crayfish (Orconectes virilis)
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OGNelson: Virile Crayfish (Orconectes virilis) juvenile
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OGNelson: Two crayfish (Orconectes virilis)
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OGNelson: Water boatman (Corixidae) riding a crayfish (Orconectes virilis) (v.2)
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OGNelson: Crayfish (Orconectes) meeting
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OGNelson: Water boatman (Corixidae) riding a crayfish (Orconectes virilis)
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OGNelson: Crayfish eye (Orconectes)
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OGNelson: Snail gorging at all-you-can-eat buffet
OGNelson: Backswimmer (Family Notonectidae), Clam River, WI