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Zoos face off in 'cute animal tweet off'

Zookeepers welcomed a female gray seal pup at Smithsonian's National Zoo in Washington, D.C., on Saturday, Jan. 21, 2017. (Jacqueline Conrad/Smithsonian's National Zoo)

In what might be the most adorable Twitter battle of all time, zoos across the country faced off for a "cute animal tweet off" on Wednesday, flooding the social media site with images of koalas, otters and baby animals of all sorts.

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The battle started after Smithsonian's National Zoo in Washington D.C. announced the birth of a gray seal pup with a photo of the newborn, Mashable reported.

Twitter user and Virginia resident Sarah Hill saw the post and issued a challenge to her local aquarium.

Not to be outdone, aquarium officials responded with their own cute animal contribution.

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