John Bazemore / AP

John Bazemore / AP

Georgia Aquarium's resident pregnant beluga whale Maris.

John Bazemore / AP

Animal care and training specialist Mackezie Mueller working with The Georgia Aquarium's resident pregnant beluga whale Maris.

Georgia Aquarium's resident pregnant beluga whale Maris is expected to give birth by June. She is the first mammal to conceive at the downtown Atlanta attraction since it opened in 2005.

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Don Emmert / AFP - Getty Images

Children and parents are dwarfed by a whale shark as it passes by inside a tank March 6, 2012 at the Georgia Aquarium in Atlanta, Georgia. The whale shark is the largest living fish species.

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