Massachusetts mammals

Sperm Whale in Massachusetts

Physeter macrocephalus

Native to Massachusetts S1 Critically Imperiled in Massachusetts

Not listed as nonindigenous in Massachusetts by USGS NAS; native to its Massachusetts range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

VU – Vulnerable

High risk of extinction in the wild.

Sperm Whale in Massachusetts, by the numbers

Rare in Massachusetts 74th most recorded of 93 mammals logged in Massachusetts

19 occurrence records
6 with iNaturalist photos
Nov 18, 2025 Last seen in Massachusetts

Records from 2000–2026.

19 total records count every Massachusetts occurrence from GBIF and iNaturalist; the monthly chart covers the 16 records with a full observation date.

When to look for the Sperm Whale in Massachusetts

Most sightings fall in July.

16 Massachusetts occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence. Based on a small number of dated records; the seasonal pattern may not be representative.

Monthly Massachusetts records (table)
MonthRecords
January2
February0
March0
April1
May0
June1
July4
August2
September0
October2
November1
December3

Monthly sperm whale occurrence records (iNaturalist and GBIF) in Massachusetts, 2000–2026.

Seasonality

Year-round in Massachusetts, with recorded sightings peaking in July, with a smaller rise in December.

Occurrence map

Where Sperm Whale has been recorded in Massachusetts

19 records mapped · zoom and drag to explore

13 Massachusetts records mapped

Where it's recorded in Massachusetts

CountyRecords
Plymouth County 6
Barnstable County 4
Nantucket County 1
Essex County 1
Other localities 7

The complete county distribution, spread across 4 Massachusetts counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Massachusetts’s occurrence tallies for the sperm whale hold just 19 records, spread thinly across nearly every month with no real cluster to point to.

Waters too shallow for its usual habits

A sperm whale needs very deep water to do what it does: dive along continental slopes and submarine canyons after squid far below the reach of light. Massachusetts’s coastal waters and the shallower stretches of Cape Cod Bay don’t offer that, so the handful of records here mostly reflect animals passing through deeper water off the continental shelf edge rather than the whale settling into any one spot the way it does over canyons farther offshore.

Strandings tell the Massachusetts story

Because so few sperm whales come close enough to shore to be seen alive, much of what reaches Massachusetts’s record comes from strandings rather than sightings. Cape Cod’s hook-shaped coastline is one of the most closely watched marine mammal stranding sites in the country, and a beached sperm whale, rare as it is, draws the kind of attention a distant blow far offshore never would.

Status in Massachusetts

NatureServe ranks the sperm whale S1, critically imperiled, and G3 globally, and it’s native to Massachusetts waters. Sparse records here don’t mean the whale has left the region; a deep-diving squid hunter like this one was never going to leave much of a trace along a coastline better known for feeding right whales.

Occurrence data from iNaturalist and GBIF.

More mammals in Massachusetts in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries