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Learn the wildlife of the U.S. national parks

Learn the wildlife of Acadia National Park

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2,767 species have research-grade observations inside Acadia National Park on iNaturalist. KnowKi turns the most recorded into short lessons with real photos, so you know what you're looking at before you go.

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Most recorded here

The species with the most research-grade observations on iNaturalist, and how many each has. Most recorded doesn't mean native.

Birds

  1. American Herring Gull Larus smithsonianus778
  2. Dark-eyed Junco Junco hyemalis271
  3. Double-crested Cormorant Nannopterum auritum239
  4. Common Eider Somateria mollissima228
  5. Black-throated Green Warbler Setophaga virens191
  6. Song Sparrow Melospiza melodia184
  7. Yellow-rumped Warbler Setophaga coronata166
  8. Common Loon Gavia immer157
  9. Black-capped Chickadee Poecile atricapillus150
  10. Cedar Waxwing Bombycilla cedrorum144

Plants

  1. Three-toothed cinquefoil Sibbaldiopsis tridentata1,575
  2. Sheep laurel Kalmia angustifolia1,186
  3. Canadian bunchberry Cornus canadensis1,108
  4. Black crowberry Empetrum nigrum1,068
  5. Rugosa rose Rosa rugosa1,060
  6. White meadowsweet Spiraea alba998
  7. Striped maple Acer pensylvanicum864
  8. Sweetfern Comptonia peregrina795
  9. Pitch pine Pinus rigida766
  10. Northern whitecedar Thuja occidentalis719

Mammals

  1. American Red Squirrel Tamiasciurus hudsonicus790
  2. White-tailed Deer Odocoileus virginianus415
  3. North American Porcupine Erethizon dorsatum325
  4. American Beaver Castor canadensis195
  5. Eastern Chipmunk Tamias striatus133
  6. Snowshoe Hare Lepus americanus87
  7. Harbor Seal Phoca vitulina39
  8. North American River Otter Lontra canadensis34
  9. Red Fox Vulpes vulpes34
  10. Grey Seal Halichoerus grypus32

Insects

  1. Tricolored Bumble Bee Bombus ternarius429
  2. Hickory Tussock Moth Lophocampa caryae379
  3. Monarch Danaus plexippus277
  4. Japanese Beetle Popillia japonica187
  5. North American Luna Moth Actias luna157
  6. Red-spotted Admiral Limenitis arthemis157
  7. American Lady Vanessa virginiensis140
  8. Asian Lady Beetle Harmonia axyridis133
  9. Two-spotted Bumble Bee Bombus bimaculatus113
  10. Two-striped Grasshopper Melanoplus bivittatus105

Spiders and kin

  1. Cross Orbweaver Araneus diadematus114
  2. Goldenrod Crab Spider Misumena vatia86
  3. Yellow Garden Spider Argiope aurantia35
  4. Marbled Purple Jumping Spider Phidippus purpuratus33
  5. Zebra Jumping Spider Salticus scenicus30
  6. Bronze Jumping Spider Eris militaris26
  7. Nordmann's Orbweaver Spider Araneus nordmanni23
  8. Striped Fishing Spider Dolomedes scriptus23
  9. Banded Garden Spider Argiope trifasciata21

Reptiles

  1. Common Garter Snake Thamnophis sirtalis335
  2. Painted Turtle Chrysemys picta120
  3. Eastern Milksnake Lampropeltis triangulum118
  4. Common Snapping Turtle Chelydra serpentina114
  5. Red-bellied Snake Storeria occipitomaculata112
  6. Ring-necked Snake Diadophis punctatus90
  7. Smooth Greensnake Opheodrys vernalis78

Amphibians

  1. American Bullfrog Lithobates catesbeianus1,030
  2. Eastern Red-backed Salamander Plethodon cinereus386
  3. Green Frog Lithobates clamitans312
  4. Spotted Salamander Ambystoma maculatum288
  5. Pickerel Frog Lithobates palustris285
  6. Eastern Newt Notophthalmus viridescens150
  7. Spring Peeper Pseudacris crucifer107
  8. Wood Frog Lithobates sylvaticus82
  9. Gray Treefrog Dryophytes versicolor66
  10. American Toad Anaxyrus americanus45

Fish

  1. Brook Trout Salvelinus fontinalis79
  2. Banded Killifish Fundulus diaphanus62
  3. Pumpkinseed Lepomis gibbosus26

Mollusks

  1. Common Periwinkle Littorina littorea450
  2. Tortoiseshell Limpet Testudinalia testudinalis135
  3. Leopard Slug Limax maximus121
  4. Atlantic Dogwhelk Nucella lapillus110
  5. Blue Mussel Mytilus edulis105
  6. Northern Horse Mussel Modiolus modiolus78
  7. Rough Periwinkle Littorina saxatilis51
  8. Flat Periwinkle Littorina obtusata34
  9. Tree slug Lehmannia marginata33
  10. Barnacle-eating dorid Onchidoris bilamellata31

How a trip works

A trip has its own trail of lessons: meet six species, match them to new photos, then practice with four choices. Species you learn go into your Fieldbook, and starting a trip earns its Passport stamp. Your home place stays as it is.

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Species lists and counts from research-grade observations on iNaturalist, as of October 2026. KnowKi is not affiliated with the National Park Service. Free, with no ads, no account and no purchases.