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Brookfield Zoo Dolphin Calf Dies Suddenly Four Days After Birth

The zoo has opened a necropsy to investigate the unexpected loss of its first dolphin calf in more than ten years.

Bottlenose dolphins Allie and Tapeko are joined by a newly born calf at the Brookfield Zoo Chicago on June 7, 2025. (Brookfield Zoo Chicago)
File photo.
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Overview

  • The male bottlenose calf was born on June 7 to Allie, a 38-year-old first-time mother, marking Brookfield Zoo’s first such birth since 2014.
  • On the evening of June 11, animal care teams observed a rapid change in the calf’s behavior and within minutes he became unresponsive and passed away.
  • Veterinary staff have launched a necropsy to determine the cause of death and identify any underlying health issues.
  • Allie and the rest of the Seven Seas dolphin pod are under continuous observation by veterinary and animal care personnel.
  • Researchers aim to use findings from this case to advance understanding of dolphin neonatology given that one in five calves born to first-time mothers in the wild do not survive their first year.