Humpback whales carry NatureServe’s S2, imperiled, rank in Massachusetts, the most precarious status of any mammal in the state’s top 20 by record count, a reminder that a healthy number of sightings doesn’t always mean a healthy population. Nearby Stellwagen Bank, a rich feeding ground off Cape Cod, draws whales close enough to shore that Cape Cod National Seashore alone anchors most of the state’s named records.
Reports are almost nonexistent from December through March, then build through summer to a sharp August peak, when whales concentrate inshore to feed on schooling fish before heading south. That tight seasonal window reflects a genuinely migratory animal passing through, not a resident population that’s simply harder to spot in winter.
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