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Chicago Zoological Society officials say three Brookfield Zoo bottlenose dolphins are pregnant.
Officials said Monday that 26-year-old Allie, 31-year-old Tapeko and 10-year-old Spree are due to give birth this summer and fall.
Allie has had two previous calves and Tapeko, three. But first-time mother Spree will require extra care as her pregnancy will have greater risks, as with other mammals.