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In this photo taken Sunday, Dec. 20, 2009 and provided by the ...

Mon Dec 21, 5:54 PM ET

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In this photo taken Sunday, Dec. 20, 2009 and provided by the John G. Shedd Aquarium in Chicago, a 5-foot, 6-inch long male beluga whale calf weighing 152 pounds swims in his enclosure at the aquarium after being born Sunday. It is the second time in a week a beluga whale at he aquarium has given birth. Officials with the aquarium say the mother, Naya, needed some assistance from animal experts.

(AP Photo/John G. Shedd Aquarium, Keith Pamper)