No Way, José!

Fuckin’ A, beavers are back! And at $15 million, Representative José E. Serrano gets naming rights:

A crudely fashioned lodge perched along the snow-covered banks of the Bronx River — no more than a mound of twigs and mud strewn together in the shadow of the Bronx Zoo — sits steps away from an empty parking lot and a busy intersection.

Scientists say that the discovery of this cone-shaped dwelling signifies something remarkable: For the first time in two centuries, the North American beaver, forced out of town by agricultural development and overeager fur traders, has returned to New York City.

The discovery of a beaver setting up camp in the Bronx is a testament to both the animal’s versatility and to an increasingly healthy Bronx River.

A few years ago the river was a dumping ground for abandoned cars and rubber tires, but it has been brought back to life recently through a big cleanup effort.

The biologists who discovered the beaver say they have nicknamed it José, after United States Representative José E. Serrano of the Bronx, who has directed $15 million in federal funds toward the river’s rebirth.

In an interview, Mr. Serrano said he had always envisioned the river getting cleaner, “but I don’t know to what extent I imagined things living in it again.”

A number of people reported seeing the beaver last fall, but biologists figured that the sightings were much more likely to have been of muskrats, which are somewhat common in the area.

But the biologists were intrigued enough to investigate, and after trudging the riverbanks, they spotted gnawed tree stumps and the 12-foot-wide lodge — evidence that pointed to beavers, which are rarely seen in the wild because they tend to work at night and avoid people.

Then on Wednesday, the biologists were able to videotape the animal on film, swimming up the river looking for more material to insulate its home. The animal is several feet long, two or three years old, and appeared to be a male in search of a mate, said one of the biologists, Patrick Thomas, the curator of mammals at the Bronx Zoo, which is run by the Wildlife Conservation Society.