Bottlenose dolphin calf born at Brookfield Zoo with maternal support

In the early hours of June 7, 2025, a significant event took place at the Brookfield Zoo in Chicago, USA, where a bottlenose dolphin named Allie gave birth to a calf. This birth was closely monitored by a team of veterinarians and was unique not only because of its significance for the species but also due to the supportive presence of another experienced dolphin mother named Tapeko. Allie's labor began the previous day when her body temperature dropped, signaling the onset of the birthing process. After more than an hour of labor, the calf emerged and instinctively swam to the surface for its first breath, demonstrating the immediate natural behaviors typical among dolphins during such crucial moments. This event is particularly remarkable as it marks the first successful birth of the species, scientifically known as Tursiops truncatus, since 2014, a significant milestone for the zoo and dolphin conservation efforts. The birth of the calf is a testament to the cooperative nature of dolphins, where young ones provide support to each other. In this instance, Tapeko, aged 43, played a vital role in ensuring the safety of both Allie and her newborn by staying close to them throughout the labor process. The involvement of another mother dolphin is not uncommon in the natural world, as dolphins often assist each other during calving, reflecting their social structures and behaviors. Following the birth, zoo officials reported that the calf appears to be in good health, estimated to weigh around 35 pounds and measure nearly four feet in length. These dimensions are comparable to that of an adult golden retriever, which highlights the early stage of development for the young dolphin. The Brookfield Zoo has decided to close its Seven Seas exhibit temporarily to allow the new mother and calf to bond, which is essential for the calf's development in the initial days after birth. Bonding experiences include the calf learning to slipstream alongside its mother, an adaptive behavior that helps conserve energy while swimming. Over the next month, the zoo’s animal care and veterinary teams will monitor the calf closely, tracking milestones such as successful nursing and swimming activity. These observations are critical in the first 30 days, as this period can fundamentally influence the calf's growth and strength. Eventually, zoo officials plan to conduct a paternity test to determine the calf's father among the male dolphins residing at the facility. Naming of the calf will also take place later in the summer months, as the zoo waits for the proper opportunity to observe the new family dynamics fully. This birth is part of broader conservation efforts, given that approximately one-third of marine mammals face significant risks in the wild. The zoo is a participant in global initiatives aimed at addressing these challenges and promoting the conservation of dolphin populations.