Photo-ID has become one of the most important tools in cetacean research and conservation worldwide. Through repeated sightings and image comparisons, we can study movements, migration routes, site fidelity, population size, survival rates, reproduction, social structures, behaviour, and habitat use of individuals and populations over time.

Because the technique is non-invasive, it allows long-term monitoring while minimising stress and disturbance to the animals. It also provides valuable information about health and conservation threats, helping us document injuries caused by vessel strikes, fishing gear entanglement, disease, pollution, or interactions with other cetaceans.

Today, Photo-ID catalogues connect organisations, researchers, whale watching operators, and citizen scientists around the world. By sharing images and comparing catalogues between regions, it is possible to track the movements of individuals across vast ocean areas and better understand how populations are connected globally. In some cases, whales photographed thousands of kilometres apart have later been identified as the same individual.

Beyond its scientific value, Photo-ID creates a connection between people and individual animals. By recognising and following known cetaceans over the years, we can better understand their stories, relationships, movements, and the challenges they face in an increasingly threatened marine environment.

It remains one of the most powerful and effective tools for understanding and protecting whales, dolphins, and porpoises around the world.