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

"Underwater Census: Revolutionary DNA Technique Uncovers Hidden Secrets of New York City's Ecosystems Scientists have made a groundbreaking discovery in the Big Apple, using a cutting-edge technique to map the intricate web of life beneath the city's waters. By analyzing environmental DNA (eDNA) in water samples, researchers have gained a remarkably detailed snapshot of the diverse species that call New York City's ecosystems home. The findings, which offer a previously unseen glimpse into the city's aquatic world, hold immense potential for monitoring ecosystems worldwide. As concerns about biodiversity and environmental health continue to grow, this innovative approach could become a powerful tool for conservationists and scientists seeking to protect our planet's precious ecosystems."

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.