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The birth took place in the afternoon as visitors and staff looked on, according to aquarium officials.
As of Sunday morning, the mother and pup remain in the tide pool, resting.
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The mother had most likely entered the tide pool seeking shelter from the stormy seas, aquarium officials said.
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In December, another sea otter mother entered the tide pool's sheltered waters and gave birth, according to aquarium officials.
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A snapshot of a lazy day for mom and pup between sun and showers. Best of luck in the wild #MontereyBay you two! pic.twitter.com/WCuUrgjqtf
— Monterey Aquarium (@MontereyAq) March 7, 2016
VIDEO: Wild sea otter giving birth in our Great Tide Pool yesterday. Nature in action! https://t.co/UYJHWqgs6a pic.twitter.com/O4MDO8YxgQ
— Monterey Aquarium (@MontereyAq) March 6, 2016
|REPLAY| Sea For Yourself! — Brand new baby sea otter floating with mom... #katch #Periscope https://t.co/Oypt0iORbd pic.twitter.com/mTk5Dtaaq3
— Monterey Aquarium (@MontereyAq) March 6, 2016
|REPLAY| Sea Breaking News! — Wild sea otter about to give birth outsid... #katch #Periscope https://t.co/Eba1HEz5et pic.twitter.com/NlgAE2v8GL
— Monterey Aquarium (@MontereyAq) March 5, 2016
