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Dolphin calf dies at Baltimore’s National Aquarium

One of two bottlenose dolphin calves born at Baltimore’s National Aquarium in April has died.

An aquarium spokeswoman said Thursday that the male calf died Tuesday. The cause of death was not immediately determined and a necropsy was being performed. Tests results were expected in about two weeks. The aquarium said the other calf, a female born in April to another dolphin, is doing well, as is the mother of the calf that died.

Aquarium officials said veterinarians had concerns about the mother because the calf was her first-born and about the amount of time it was taking the calf to nurse. However, the calf had been active and playing before it died.

Infant mortality is high among dolphin calves, with a third dying in their first year.