This June 2, 2014, photo provided by the Oregon Department of Fish and Wildlife, shows two wolf pups fathered by Oregon's famous wandering wolf, OR-7, peering out from a den in the Cascade Range east of Medford, Ore. They are the first known pups born in the Cascades of Oregon since the 1940s. OR-7 left his pack in northeastern Oregon in 2011 in search of a mate, traveling thousands of miles across Oregon and into Northern California before finding one last winter in the southern Cascades. A GPS tracking collar led state and federal biologists to the site on the Rogue River-Siskiyou National Forest. (AP Photo/Oregon Department of Fish and Wildlife)

Biologists say Oregon's famous wandering wolf has fathered pups with a mate in the southern Cascade Range—the first confirmed wolf pack in those mountains since the 1940s.

The U.S. Fish and Wildlife Service announced Wednesday that biologists went to a site on the Rogue River-Siskiyou National Forest east of Medford on Monday where photos and a GPS tracking collar showed the wolf known as OR-7 has been living with a mate. They saw two and may have heard more.

OR-7 set off in search of a mate in September 2011, covering thousands of miles from his birthplace in northeastern Oregon to Northern California and back into southwestern Oregon.

He is a descendant of wolves that were reintroduced in Idaho then migrated into Oregon in the 1990s.