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Hawaii Mammals: Species List With Pictures

Last checked November 3, 2026 against official sources.

On this page
  1. All 42 mammals
  2. When they are active
  3. How to report
  4. About this list
  5. Sources

Hawaii DLNR Division of Forestry and Wildlife: Approximately 26 species of marine mammals, mostly cetaceans, are considered resident or occasional visitors to Hawai'i.

This page lists 42 mammals. 15 are nonnative. Hawaii DLNR Division of Forestry and Wildlife gives a total of 26; the 42 here are the mammals official sources name one by one.

All 42 mammals

From A to Z.

No confirmed photo of Blainesville's beaked whale or densebeaked whale

Blainesville's beaked whale or densebeaked whale

Mesoplodon densirostris

Where in Hawaii
Marine (Hawaiian waters) Hawaii DLNR Division of Forestry and Wildlife
No confirmed photo of Feral and unleashed dogs

Feral and unleashed dogs

Canis familiaris

Nonnative

Feral Pig
Photo: Cullen Hanks · CC BY 4.0 · iNaturalist

Feral Pig

Sus scrofa

Nonnative

Size
Adults average 75 to 250 pounds, but some get twice as large. They can stand up to 3 feet tall and reach 5 feet long, and males (boars) are larger than females (sows). FWC says Florida wild hogs can weigh more than 150 pounds and be 5 to 6 feet long. Ohio State Extension says Ohio adults typically weigh 125 to 200 pounds.
How to recognize it
  • Look much like domestic hogs but are generally thinner, with thicker hides of coarse, bristly hair and longer tusks
  • Four continuously growing tusks, 2 on top and 2 below
  • Russian (Eurasian) boar type: long, straight, narrow snout; dark-colored or camouflage coat; light-tipped bristles
Where in Hawaii
Hunted on Hawai'i Is., Maui, Moloka'i, O'ahu, Kaua'i (DLNR hunting table) Hawaii DLNR Division of Forestry and Wildlife
Conservation
game mammal
66 records by month.

Full Feral Pig guide

No confirmed photo of Hawaiian hoary bat ('ope'ape'a)

Hawaiian hoary bat ('ope'ape'a)

Lasiurus semotus

Where in Hawaii
All Main Hawaiian Islands except Ni'ihau Hawaii DLNR Division of Forestry and Wildlife
Conservation
Federally Listed as Endangered; State Listed as Endangered
What the sources say

Habitat: Roosts in trees 1 to 9 meters (3-29 feet) off the ground (Hawaii DLNR Division of Forestry and Wildlife)

No confirmed photo of Hawaiian monk seal ('ilio-holo-i-ka-uaua)

Hawaiian monk seal ('ilio-holo-i-ka-uaua)

Monachus schauinslandi

Where in Hawaii
Marine (Hawaiian waters) Hawaii DLNR Division of Forestry and Wildlife
Conservation
Federal Endangered; State Endangered (SWAP Appendix A); NOAA: 'one of the most endangered seal species in the world'
House mouse
Photo: Emily Langdon-Lassagne · CC0 1.0 · iNaturalist

House mouse

Mus musculus

Nonnative

No confirmed photo of Humpback whale (kohola)

Humpback whale (kohola)

Megaptera novaeangliae

Where in Hawaii
Marine (Hawaiian waters) Hawaii DLNR Division of Forestry and Wildlife
Conservation
Federal Endangered; State Endangered (SWAP Appendix A)
No confirmed photo of Pacific rat

Pacific rat

Rattus exulans

Nonnative

No confirmed photo of Small Indian Mongoose

Small Indian Mongoose

Herpestes javanicus

Invasive

Where in Hawaii
O'ahu, Maui, Moloka'i, Big Island (Bishop Museum); not established on Kaua'i (SWAP) or Lana'i (Bishop Museum) Hawaii DLNR Division of Forestry and Wildlife
Conservation
Hawaii Injurious Wildlife (HAR 124)
No confirmed photo of Wild cattle

Wild cattle

Bos taurus

Nonnative

Conservation
protected game mammal (DLNR)

When mammals are active in Hawaii

Records of mammals in Hawaii peak in January to March, July to August and December. They show when people record mammals, not how many there are (about month bars).

7,702 records of mammals in Hawaii by month (GBIF, CC0 and CC BY records).

How to report

Invasive species (including any snake sighting): Pest Hotline 808-643-PEST (643-7378) or online at 643pest.org. Hawaii DLNR

About this list

The species list comes from No single official complete mammal checklist found. Native: DLNR 'Ope'ape'a page and Hawaii State Wildlife Action Plan 2025 Appendix A (all 26 marine mammals listed as SGCN); introduced: DLNR Game Mammal Hunting page, SWAP text, DLNR injurious wildlife list and HISC profiles (Hawaii DLNR Division of Forestry and Wildlife, 2025-10-01 (SWAP); DLNR pages undated, retrieved 2026-11-03). 11 more entries come from other official sources named on each card.

Venom labels come only from official sources and link to them; "Not stated" never means harmless. How labels work.

"Nonnative" and "Invasive" follow the wording of the source list. See invasive species in Hawaii.

Sources

  1. About Us (Division of Forestry and Wildlife). Hawaii DLNR Division of Forestry and Wildlife. undated page; checked November 3, 2026.
  2. Hawai'i State Wildlife Action Plan 2025 (as submitted to the Regional Review Team October 1, 2025). Hawaii DLNR Division of Forestry and Wildlife. October 1, 2025; checked November 3, 2026.
    Quoted passages (1)
    “Approximately 26 species of marine mammals, mostly cetaceans, are considered resident or occasional visitors to Hawai'i.”
  3. 'Ope'ape'a, the Hawaiian Hoary Bat. Hawaii DLNR Division of Forestry and Wildlife. undated page; checked November 3, 2026.
    Quoted passages (1)
    “Mating most likely occurs between September and December, with females usually giving birth to twins around June.”
  4. Injurious Wildlife. Hawaii DLNR Division of Forestry and Wildlife. undated page; checked November 3, 2026.
  5. Feral Cats (invasive species profile). Hawaii Invasive Species Council (Hawaii DLNR). undated page; checked November 3, 2026.
  6. Game Mammal Hunting. Hawaii DLNR Division of Forestry and Wildlife. undated page; checked November 3, 2026.
  7. Examples of Invasive Species in Hawaii. Hawaii Invasive Species Council (Hawaii DLNR). undated page; checked November 3, 2026.
    Quoted passages (1)
    “Report Invasive Species Online at 643pest.org Report Invasive Species by Phone: 808 643-PEST”
  8. GBIF.org occurrence records, human observations licensed CC0 1.0 or CC BY 4.0 only, accessed November 3, 2026. The datasets behind these counts are listed on our Sources page.