Courtesy of LCG Communications/Bronx River Alliance

The scientists were already massing when I arrived at Bronx River Forest on a steamy June morning. They were embarking on a BioBlitz. Part scientific endeavor, part publicity stunt, these events take a single-day, shotgun approach to biodiversity.

Slideshow: Welcome to BioBlitz

Join senior editor Brendan Maher as he counts everything that crawls, creeps, and swims along the Bronx River.

Looking for such diversity along the only real river in New York City would seem to require a real sense of optimism. The counts for the Bronx River have rarely been what you would call encouraging: 70 automobiles and 1,200 tires have been pulled from the 23-mile river that was described at the end of the 19th century as an "open sewer." But this rare stripe of green has been the focus of major restoration, and scientists were hopeful they would find evidence...

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