Sperm Whales Change Click Patterns When Boats Are Nearby

Researchers monitoring sperm whales off the Caribbean island of Dominica have identified a distinct variation in the mammals’ audible clicks that occurs when marine traffic is nearby. The pattern, observed during a four‑year study by Project Ceti—the Cetacean Translation Initiative, a non‑profit organization dedicated to decoding sperm‑whale communication—appears consistently in the vocalizations of 15 individual whales recorded around Dominica’s coast. By analyzing the clicks, scientists determined that the whales modify their acoustic signals in response to the noise generated by passing boats, creating a signature that can be used to infer the presence of ships in the vicinity.

The discovery provides a new tool for predicting ship proximity based solely on whale vocal behavior, offering potential applications for marine traffic monitoring and conservation efforts. Project Ceti’s findings, which expand understanding of cetacean acoustic adaptation to human activity, suggest that sperm whales may use these altered clicks as an early‑warning system, thereby enhancing their ability to navigate increasingly noisy ocean environments.