The week in pictures 13/4/12

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

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