Harbour Porpoise records belong offshore or along California’s Pacific coast, not in the state’s inland forests and deserts. Reports often follow the productive waters shaped by coastal upwelling, but they also reflect where boats and shore watchers spend time.
The deep Monterey Canyon, the continental shelf edge, and waters around the Channel Islands give observers access to very different marine habitats. Sightings don’t measure offshore population size, because effort concentrates near ports, whale-watching routes, and visible migration corridors.
The California record set combines 589 research-grade community observations with 1,107 museum and survey records. Monthly patterns can also reflect weather and observer activity, so they shouldn’t be treated as a direct count of animals.
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