Eagle watchers have four young birds to watch develop over the coming months in the Pittsburgh region.

On Monday the Audubon Society of Western Pennsylvania, which has a camera pointed at the Harmar nest, confirmed that a second eaglet had hatched and was alive. The society’s camera doesn’t look down into the nest, so it’s impossible to say whether the second egg is the pair’s final one.

Jim Bonner, the society’s executive director, said eagles in this area can lay from one to three eggs per nesting season.

A second nesting pair, the Hays eagles which have a nest along the Monongahela River, have a third egg in their nest, but it failed to hatch.

Bonner said both the Harmar eagles and the Hays eagles have two chicks in their nests. The Hays eaglets hatched weeks ago in late March but Bonner said Monday’s eaglet in Harmar isn’t behind schedule.

“There’s been quite a bit of comparison because we have cameras on two nests in the area (but) they’re right on their own schedule,” Bonner said. “It just happens to be different from the other (eagles’).”

Bonner said eaglets develop “very quickly,” and he encouraged people to use the webcams to observe the chicks as they grow and fletch — a process that takes 10 and 14 weeks. After that, the juvenile eagles will continue to spend up to eight weeks in the nest before leaving the area.

If baby birds overstay their welcome, the adult eagles will eventually drive them off, Bonner said.

There’s no way to tell where the juveniles might go once they leave the nest for good, he said, and the density of eagle nests in any area is governed mostly by the availability of food for the animals, which is plentiful in southwestern Pennsylvania.

“Continue to stay tuned and watch as they develop, and see what nature has in store for us,” Bonner said.

The Hays eagles’ nest can be viewed via a webcam operated by PixController at www.butlereagle.com.

The Harmar eagles’ nest can be viewed via webcam at the Audubon’s website at http://eagles.aswp.org/.