Rhode Island mammals

Common Dolphin in Rhode Island

Delphinus delphis

Native to Rhode Island

Not listed as nonindigenous in Rhode Island by USGS NAS; treated as native to its mapped Rhode Island range.

IUCN Red List status

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

LC – Least Concern

Widespread and abundant; not at risk.

Common Dolphin in Rhode Island, by the numbers

Occasional in Rhode Island 37th most recorded of 72 mammals logged in Rhode Island

24 occurrence records
15 with iNaturalist photos
Feb 15, 2026 Last seen in Rhode Island

Records from 2000–2026.

When to look for the Common Dolphin in Rhode Island

Most sightings fall in August.

24 Rhode Island 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 Rhode Island records (table)
MonthRecords
January0
February3
March1
April0
May1
June1
July0
August6
September0
October2
November6
December4

Monthly common dolphin occurrence records (iNaturalist and GBIF) in Rhode Island, 2000–2026.

Seasonality

Year-round in Rhode Island, with recorded sightings peaking in August, with a smaller rise in November–December.

Occurrence map

Where Common Dolphin has been recorded in Rhode Island

24 records mapped · zoom and drag to explore

11 Rhode Island records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
East Beach 2
Beavertail State Park 1

Protected places with the most common dolphin sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in Rhode Island

CountyRecords
Washington County 6
Newport County 5
Other localities 13

The complete county distribution, spread across 2 Rhode Island counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Short-beaked common dolphins are a pelagic offshore species, so listing Block Island, Ninigret, and Trustom Pond refuges is more about Rhode Island’s protected coastal geography than actual sighting spots. These animals travel well beyond sight of any shoreline overlook, typically over the continental shelf. Block Island National Wildlife Refuge anchors the state’s few records with 2 of the 24 in the dataset, fitting its position closest to open Atlantic water.

Records split into two distinct pulses, six each in August and November, with a secondary bump in December, a pattern that likely tracks the species’ seasonal movement along the outer shelf rather than any change in nearshore Rhode Island habitat. With no NatureServe state rank assigned and just 24 records total, Rhode Island’s baseline data on this species stays thin despite its established presence in Northeast Atlantic waters generally.

Occurrence data from iNaturalist and GBIF.

More mammals in Rhode Island 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
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"