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A North American River otter surfaces while hunting crayfish in the Umpqua River near Elkton in rural southwestern Oregon on September 17, 2024. River otters are considered an indicator species and their presence is a sign of improving watershed conditions. These apex aquatic predators play an important role in ecosystem health, as they eat fish, crustaceans, invertebrates, birds, and amphibians. (Photo by Robin Loznak/ZUMA Press Wire/Rex Features/Shutterstock)
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