CHICAGO, Dec. 15 (UPI) -- First-time mom Allison, a nine-year-old bottlenose dolphin, successfully birthed a male calf a the Brookfield Zoo in Chicago Friday. The baby bottlenose measured three and a half feet in length and weighed in at just under 40 pounds.
Not long after birth, zookeepers with the Chicago Zoological Society -- the organization that manages the Brookfield Zoo -- noted two key milestones. Mother and calf were observed both nursing and slipstreaming, whereby the little one floats alongside his mom as she swims, creating a hydrodynamic wake as she goes.