Yale Study Finds Tuna's Speed and Warm Blood Evolved Over 50 Million Years

A new study from Yale University has challenged a long-held scientific theory about the origins of modern tuna. Researchers found that the mass extinction event caused by an asteroid 66 million years ago did not directly drive the evolution of tuna's distinctive traits. Characteristics such as large size, high-speed swimming, and warm-bloodedness in tuna developed gradually over approximately 50 million years. The findings contradict earlier assumptions that the dinosaur extinction event was a key catalyst for the rise of these advanced predatory fish.