California Department of Fish and Wildlife officials think their mother was hit by a car in Burlingame on Nov. 9.
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The cubs are estimated to be six to 10 weeks old.
The cubs were taken to the zoo on Tuesday.
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Aside from being dehydrated and underweight, the zoo's veterinarians say the animals are in good health.
The sisters got the full spa treatment. The zoo says they were given fluids, treated for parasites and fleas, and tested for viruses.
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On Wednesday, the Oakland Zoo announced it has named the cubs: Maple and Willow!
Because they're so young, they lack the skills to survive in the wild.
Maple and Willow will stay at the zoo until they get permanent homes.