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A pair of orphaned mountain lion cubs found in Southern California have been taken in by the Oakland Zoo.

Media: Oakland Zoo/Reuben Maness

A pair of young mountain lion cubs believed to be siblings orphaned when their mother was  struck by a car in Southern California have been taken in by the Oakland Zoo, the zoo announced this week.

The two cubs, both three to four months old and each weighing about 30 pounds, were discovered in Orange County two weeks apart earlier this year, near the site where an adult female mountain lion was struck and killed by a car.

The first cub was found in someone's backyard in Silverado Canyon, and the second was found by the side of a road in Rancho Santa Margarita, according to the zoo.

Because they are close in age and were both found near the crash site, about 15 miles apart, veterinarians believe they are sons of the female who was killed, and will be conducting DNA tests to verify that the cubs are brothers.

The younglings were placed at the Oakland Zoo after consulting with the California Department of FIsh and Wildlife and a number of conservation groups, including the Bay Area Cougar Action Team, which the Oakland Zoo helped to found in 2013 with the goal of saving mountain lions whose lives were disrupted by contact with humans.

According to Lynn Cullens, Executive Director of the Mountain Lion Foundation, the mountain lion population in the Santa Anas is among the most threatened in the nation, and habitat protection will be needed to ensure the population continues to survive.

"Orphaned kittens represent the death of a mother lions, and this isolated Orange County population cannot afford the loss," said Cullens.

"We have a lot of work to do to better protect and conserve pumas, from proper education to establishing wildlife crossings and proper enclosures for pets and livestock," Amy Gotliffe, Director of Conservation at the Oakland Zoo agreed.

The cubs will eventually be housed in the zoo's 56-acre California Trail expansion, slated to open next summer. Construction is expected to be finished on a 26,000 square foot boomerang-shaped mountain lion habitat replete with caves, outcroppings and old oak trees by February.

They are currently being quarantined and cared for in the zoo's veterinary hospital, and have begun to show their personalities — the first is more cautious and shy, while the second, who arrived at the zoo on Monday, is more rambunctious and feisty, according to zookeepers. Staff are encouraging them to bond with each other and build trust in their keepers before they go on view to the public next summer in what will be one of the largest mountain lion exhibits in the world.

Filipa Ioannou is an SFGATE staff writer. Email her at fioannou@sfchronicle.com and follow her on Twitter