CONCLUSION
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The North American river otter is returning to the Bronx River after 100 years.
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The return of North American river otters indicates healthy water resources.
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These animals were common here until pollution and other factors drove them out.
BRONX, New York – A surprising discovery has been made in the New York City area: Bronx Zoo staff announced that a North American river otter has been spotted along the Bronx River for the first time in 100 years.
Photos released by local scientist R.J. Hawkins show the cute creature scurrying along the Bronx River, where it was once common until it disappeared due to pollution, habitat loss, and unregulated fishing.
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Besides being an impressive sight, it also provides strong evidence of the health of the water, as river otters are very sensitive to severe pollution and poor water quality.
River otters are apex predators that accumulate pollutants primarily through their food, ingesting them faster than they can break down toxic substances in their food and water.
These dangerous environmental conditions can lead to the complete extinction of animals from the area, such as river otters, which have not been seen in the region since the early 1900s.
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COLORADO RIVER, CO - SEPTEMBER 15: An American river otter eats along the bank of the Ruby Horse Tief section of the Colorado River west of Grand Junction on September 15, 2015 near Fruita, Colorado.
«"Today, they are considered indicators of healthy freshwater ecosystems because they depend on clean water, abundant fish, and pristine aquatic habitats," the Bronx Zoo said.
In addition, these animals eat the same foods as humans, such as oysters and clams.
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WASHINGTON, D.C. - AUGUST 28: A North American river otter enjoys a frozen meaty treat Tuesday, August 28, 2012, in Washington, D.C.
By studying their diet in local waters, we can learn what parasites, pathogens, and contaminants may be present in these food sources that affect not only these animals but also humans.
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This is a strong indication that conditions along the Bronx River are steadily improving.
Original article: The North American river otter has returned to the Bronx River after 100 years, indicating healthy water quality.