LOS ANGELES – A rare blue butterfly took flight Saturday morning on a windswept bluff of the Palos Verdes Peninsula in California. Then another. And then another.

A cluster of conservationists watched in awe. In all, 80 endangered butterflies, each bred in captivity, ventured into the wild for the first time.

It was a big step toward saving the Palos Verdes Blue butterfly from extinction. The peninsula had been its only home on Earth until 20th-century development bulldozed its habitat.

“I’m just ecstatic to be here,” biologist Jana Johnson told the gathering moments before the cobalt-blue butterflies were set free in a gully of San Pedro’s Friendship Park.

“Take a look around,” she said, nodding toward hillsides covered with homes overlooking the ocean and the Los Angeles basin. “It was wiped out by us. So it’s our job to undo the past wrongs.”

The Palos Verdes Blue is finicky, so it took conservationists a few years to prepare for its return to the park by landscaping slopes just to its liking. The thumbnail-size butterfly lays eggs on just two kinds of plants: locoweed and deerweed. Their leaves are the only things its larvae can eat after hatching.

The butterfly’s life is short, typically five or 10 days. With so little time allotted for reproduction, butterfly keepers thought it best to release 60 males and 20 females.

“We wanted to have the maximum probability of getting mated,” said Travis Longcore, science director of the Urban Wildlands Group.

Los Angeles County Supervisor Don Knabe, who released one of the butterflies into the L.A. County park, told the gathering of conservationists that he was pleased to hear there were now as many as 10,000, even if most are still in captivity.

Still, biologists say it will take years to get enough Palos Verdes Blue surviving on their own in the wild to have them removed from the federal list of endangered species.