BOULDER, Colo. (CBS4)– Two mountain lions have been spotted in residential areas over the past two days and wildlife officials say it’s something that may happen more as the temperatures continue to drop.

One mountain lion was tranquilized and relocated while a Boulder neighborhood near 13th and Cascade was placed on lockdown for several hours. Neighbors said she has been a frequent visitor to their community.

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People who live in that neighborhood told CBS4 it’s a common occurrence in the winter.

“I’d just be wary of the mountain lion in the area,” said Boulder resident Britney Camack while walking her dog.

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Wildlife officers tranquilized the female mountain lion. The wildcat was wearing a tracking collar after being captured five years ago.

Colorado Parks and Wildlife spokeswoman Jennifer Churchill said humans shouldn’t be afraid.

“That is definitely prime habitat for lions and bears. For the most part, those animals do everything they can to avoid us,” said Churchill.

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Wildlife officers initially believed the lion was pregnant and was be checked out by a veterinarian in Fort Collins. Unfortunately the lion was sick and had fluid in her abdomen. She was euthanized.