Scientists have observed that blue whale songs have dropped by nearly 40%, a troubling shift in one of the ocean’s most iconic sounds. For the largest animals on Earth, vocalization isn’t random—it’s closely tied to feeding success and overall energy levels. When krill—their primary food source—is abundant, blue whales sing more frequently and for longer periods. But when food becomes scarce, they conserve energy, and their songs grow quieter. The recent decline in vocalizations suggests whales