Blog Post Image: Dolphins keep lifelong social memories, longest in a non-human species

Jason Bruck, PhD’13, records video of a then-four-year-old dolphin named Allison at the Brookfield Zoo. In his study, Bruck played recordings of signature whistles to dolphins that had once lived with each other. He found that dolphins responded significantly more to whistles from animals they once knew. Photo by Jim Schulz/Chicago Zoological Society