SALEM, Ore. (AP) – At least four pups have been born to a pack of wolves that recently established itself in western Oregon.

The U.S. Fish and Wildlife Service announced Friday that a photo from a trail camera confirmed the pups’ existence. The photo showed them, gray with white streaks, walking on an unpaved road with a larger wolf. The existence of the pack, numbering three wolves, had been officially confirmed early this year.

The pups are growing fast. Officials with the federal and state wildlife departments placed a GPS collar on one of them, a 52 pound (23 kilogram) female, on Sept. 26 in the Umpqua National Forest. The collar’s biodegradable foam spacer will continue allow the collar to fit as the wolf grows into an adult. The U.S. Fish and Wildlife Service said the wolf is nearly six months old.

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