How many rats are in New York City? Scientists find new clues in the East River.

"Hidden World Revealed: Scientists Uncover New York City's Secret Life Through eDNA Analysis A groundbreaking study has shed light on the intricate web of life beneath New York City's bustling streets, using a revolutionary technique that's set to transform the way we understand ecosystems worldwide. By analyzing environmental DNA (eDNA) in water samples, researchers have gained a surprisingly detailed snapshot of the city's diverse wildlife, from fish and birds to plants and microorganisms. This innovative approach could have far-reaching implications for conservation efforts, allowing scientists to monitor ecosystems in real-time and track the impacts of climate change, pollution, and urban development. As the world's cities continue to grow and evolve, this pioneering research offers a new perspective on the complex relationships between humans and the natural world."

An analysis of eDNA in water samples reveal a surprisingly detailed snapshot of life across New York City. The technique could help scientists monitor ecosystems everywhere.