The waters off Horta host sperm whales year-round, a residency pattern recorded nowhere else in the Azores with such consistency. The Condor Seamount and Princess Alice Bank lie within two hours' sail, their submarine topography funneling nutrient-rich currents that sustain squid populations and the cetaceans that hunt them. Marine biologists working from Horta have catalogued over forty individual sperm whales by fluke markings since the early 2000s, identifying matrilineal pods that return to the same hunting grounds across decades. Common dolphins, bottlenose dolphins, and Risso's dolphins appear in mixed aggregations during summer months, while pilot whales transit the channel between Faial and Pico with seasonal regularity. Horta's whaling past ended in 1987 when the last factory closed along the harbor's south quay, the same waterfront where modern whale-watching operators now moor their rigid inflatables and research catamarans. Former whale spotters, known as vigias, once guided harpoon boats from cliffside lookouts; today their descendants staff the same stone towers, radioing GPS coordinates to tour vessels when cetaceans surface. The transition from extraction to observation economy took less than a decade, driven by European Union fishing quotas and the Azores' designation as a cetacean sanctuary in 1993. Horta's marina became the staging point for the Atlantic's longest-running photo-identification studies, with universities from Lisbon, the Canaries, and North America sending graduate researchers each summer. The Horta whale watching tour departs from Cais de Santa Cruz, the working harbor that serves both recreational traffic and inter-island ferries. Operators licensed by the Regional Directorate for Sea Affairs maintain strict approach protocols: engines cut at 100 meters, no bow approaches, and a maximum of three vessels per sighting. Sperm whales dive for forty to sixty minutes, surfacing to breathe in predictable sequences that allow patient observation without pursuit. Hydrophones record clicks and codas during deeper dives, data that feeds into the Azores Cetacean Movement Ecology project's long-term acoustic archive. Faial's steep submarine drop-off begins less than a nautical mile from shore, meaning sightings occur within thirty minutes of departure on most days between April and October, with spring and autumn offering the highest encounter rates for both resident and migratory species.