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Three Portola Valley mountain lion cubs were rescued and transported to the Oakland Zoo for rehabilitation on Jan. 26, 2025. Courtesy Oakland Zoo.

Fern, one of three mountain lion cubs rescued from Portola Valley in late January, has tested positive for giardia, an intestinal infection that is spread through contaminated water, food, feces and other surfaces. She is currently being treated, according to the Oakland Zoo. 

The three cubs were found and rescued from a Portola Valley cul-de-sac after residents reported a dead female mountain lion on the side of Portola Road weeks before. On Jan. 26, local wildlife officials were able to capture the cubs and take them to the Oakland Zoo for rehabilitation. 

On Feb. 7, the Oakland Zoo posted an update about Fern on Instagram, stating she was lethargic and not eating “with the same gusto” as her brothers Thistle and Spruce. She received a full physical exam, CT scan and bloodwork, according to the post. 

As of Saturday, Fern has been eating much better, said Oakland Zoo spokesperson Isabella Linares. Thistle and Spruce are doing well and all three are gaining weight, she added. 

The zoo clarified that the cubs will not be staying at its facilities long term. Officials there are unsure where the cubs will be moving. An announcement will be made once the California Department of Fish and Wildlife chooses their forever home.

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Jennifer Yoshikoshi joined The Almanac in 2024 as an education, Woodside and Portola Valley reporter. Jennifer started her journalism career in college radio and podcasting at UC Santa Barbara, where she...

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