Mammals of New Hampshire

52 established wild species in New Hampshire. Plus 15 range-listed species with few or no digitized records.

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Beaver swimming low in murky green pond water with only its wet head and back above the surface

American Beaver

Castor canadensis

Common in New Hampshire 1,343 sightings
Size 60–90 cm2–3 ft Weight 11–32 kg24.3–70.5 lb active day & night river

Sightings by month

Oso negro (Ursus americanus), Parque natural provincial Tatshenshini-Alsek, Yukón, Canadá, 2017-08-25, DD 85

American Black Bear

Ursus americanus

Common in New Hampshire 916 sightings
Size 1.2–2 m3.9–6.6 ft Weight 40–250 kg88.2–551.2 lb active by night conifer forest

Sightings by month

Mustela Erminea head

American Ermine

Mustela erminea

Occasional in New Hampshire 49 sightings
Size 17–33 cm6.7–13 in Weight 70–260 g2.5–9.2 oz active by night coniferous forest

Sightings by month

Marten in a tree

American marten

Martes americana

Occasional in New Hampshire 125 sightings
Size 32–45 cm12.6–17.7 in Weight 0.5–1.4 kg1.1–3.1 lb active by night lake

Sightings by month

Norka amerykańska (neovison vison)

American Mink

Neogale vison

Occasional in New Hampshire 118 sightings
Size 33–45.7 cm13–18 in Weight 0.5–1.4 kg1–3 lb active day & night lake

Sightings by month

American pygmy shrew crossing an asphalt path

American pygmy shrew

Sorex hoyi

Common in New Hampshire 179 sightings
Size 5–7 cm2–2.8 in Weight 2–5 g0.1–0.2 oz active day & night deciduous forest

Sightings by month

Tamiasciurus hudsonicus James Gardens

American Red Squirrel

Tamiasciurus hudsonicus

Common in New Hampshire 1,261 sightings
Size 17–23 cm6.7–9.1 in Weight 140–310 g4.9–10.9 oz active by day wetland

Sightings by month

American water shrew swimming at the surface of a stream, seen from above

American water shrew

Sorex palustris

Occasional in New Hampshire 43 sightings
Size 8 cm3.1 in Weight 8–18 g0.3–0.6 oz active day & night river

Sightings by month

Atlantic white-sided dolphin leaping clear of the water at Stellwagen Bank, showing the yellow blaze on its tail stock

Atlantic White-sided Dolphin

Leucopleurus acutus

Marginal occurrence · 8 records
Size 2.1–2.8 m6.9–9.2 ft Weight 180–230 g6.3–8.1 oz active day & night continental shelf

Sightings by month

Big Brown Bats (Eptesicus fuscus)

Big Brown Bat

Eptesicus fuscus

Occasional in New Hampshire 79 sightings
Size 7.5 cm3 in Weight 17 g0.6 oz active by night agricultural

Sightings by month

Bobcat (Lynx rufus)

Bobcat

Lynx rufus

Common in New Hampshire 557 sightings
Size 30–60 cm11.8–23.6 in Weight 4–18 kg8.8–39.7 lb active by night forest edge

Sightings by month

Lynx Canadensis

Canada Lynx

Lynx canadensis

Marginal occurrence · 3 records
Size 48–56 cm18.9–22 in Weight 5–17 kg11–37.5 lb active by night coniferous forest
Common Raccoon in Hugh Taylor Birch State Park

Common Raccoon

Procyon lotor

Common in New Hampshire 572 sightings
Size 40–70 cm1.3–2.3 ft Weight 3.5–9 kg7.7–19.8 lb active by night mixed forest

Sightings by month

Mother Coyote Sitting, Watching Over Den, Photo 1 of 2 (47924154788)

Coyote

Canis latrans

Common in New Hampshire 696 sightings
Size 0.8–1 m2.5–3.3 ft Weight 7–21 kg15.4–46.3 lb active day & night urban

Sightings by month

Eastern Chipmunk (Tamias striatus)

Eastern Chipmunk

Tamias striatus

Common in New Hampshire 2,097 sightings
Size 16.6 cm6.5 in Weight 93 g3.3 oz active by day urban

Sightings by month

Blacklick Woods - Eastern cottontail feeding 1

Eastern Cottontail

Sylvilagus floridanus

Common in New Hampshire 613 sightings
Size 36–43 cm14.2–16.9 in Weight 0.8–1.5 kg1.8–3.3 lb active day & night lake

Sightings by month

Grey squirrel (Sciurus carolinensis) 01

Eastern Gray Squirrel

Sciurus carolinensis

Common in New Hampshire 1,756 sightings
Size 23–30 cm9.1–11.8 in Weight 400–710 g0.9–1.6 lb active by day wetland

Sightings by month

Eastern red bat roosting among green leaves, disguised as a dead leaf

Eastern Red Bat

Lasiurus borealis

Rarely seen in New Hampshire 8 sightings
Size 9.3–11.7 cm3.7–4.6 in Weight 7–13 g0.2–0.5 oz active by night desert

Sightings by month

Eastern small-footed myotis clinging to a weathered wooden post in daylight, unhandled and alert

Eastern Small-footed Myotis

Myotis leibii

Marginal occurrence · 4 records
Size 7.5–8.5 cm3–3.3 in Weight 5 g0.2 oz active by night cave
AI-generated image: Eastern Water Shrew drinking at stream edge beside mossy log. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Eastern Water Shrew

Sorex albibarbis

Occasional in New Hampshire 43 sightings
Size 13–17 cm5.1–6.7 in Weight 8–18 g0.3–0.6 oz active day & night riparian

Sightings by month

European rabbit feeding in dry vegetation

European Rabbit

Oryctolagus cuniculus

Marginal occurrence · 3 records
Size 34–50 cm13.4–19.7 in Weight 1–2.5 kg2.2–5.5 lb active by night grassland

Sightings by month

Fin whale from air

Fin Whale

Balaenoptera physalus

Marginal occurrence · 6 records
Size 17–22 m55.8–72.2 ft Weight 40000–80000 kg88185–176370 lb active by day coastal
Martes Pennanti

Fisher

Pekania pennanti

Common in New Hampshire 157 sightings
Size 75–95 cm2.5–3.1 ft Weight 3.5–6 kg7.7–13.2 lb active dawn & dusk wetland

Sightings by month

Gray fox standing in dappled woodland

Gray Fox

Urocyon cinereoargenteus

Common in New Hampshire 257 sightings
Size 0.8–1.1 m2.5–3.7 ft Weight 3–9 kg6.6–19.8 lb active day & night brushy woodland

Sightings by month

Groundhog (Marmota monax)

Groundhog

Marmota monax

Common in New Hampshire 509 sightings
Size 50.6 cm19.9 in Weight 3.4 kg7.5 lb active by day woodland

Sightings by month

Common seal (Phoca vitulina) 2

Harbor Seal

Phoca vitulina

Occasional in New Hampshire 52 sightings
Size 1.4–1.9 m4.6–6.2 ft Weight 55–170 kg121.3–374.8 lb active by day coastal

Sightings by month

Phocoena phocoena.2

Harbour Porpoise

Phocoena phocoena

Occasional in New Hampshire 13 sightings
Size 1.4–1.9 m4.6–6.2 ft Weight 45–70 kg99.2–154.3 lb active by night coastal

Sightings by month

Harp Seal (Pagophilus groenlandicus), Greenland Sea IMG 5032

Harp Seal

Pagophilus groenlandicus

Marginal occurrence · 3 records
Size 1.8 m5.8 ft Weight 141.1 kg311.1 lb active by day coastal
House mouse in dry plant litter

House Mouse

Mus musculus

Rarely seen in New Hampshire 9 sightings
Size 5–10 cm2–3.9 in Weight 12–30 g0.4–1.1 oz active by night agricultural

Sightings by month

Humpback whale (Megaptera novaeangliae) with calf Moorea 2

Humpback Whale

Megaptera novaeangliae

Occasional in New Hampshire 26 sightings
Size 12–17 m39.4–55.8 ft Weight 25000–40000 kg55115.6–88185 lb active by day marine

Sightings by month

Least Weasel (Mustela nivalis)

Least Weasel

Mustela nivalis

Marginal occurrence · 1 record
Size 26 cm10.2 in Weight 50 g1.8 oz active by night grassland
Long-finned pilot whale spyhopping at the surface, showing its bulbous forehead

Long-finned Pilot Whale

Globicephala melas

Marginal occurrence · 2 records
Size 7.1 m23.3 ft Weight 1060 kg2336.9 lb active by night urban
AI-generated image: Long-tailed Shrew in side profile on moss-covered wet rocks. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Long-tailed Shrew

Sorex dispar

Occasional in New Hampshire 26 sightings
Size 6.6 cm2.6 in Weight 3–8 g0.1–0.3 oz active day & night river

Sightings by month

Long-tailed weasel standing alert in grass with its black-tipped tail curled behind it, Sonoma County, California

Long-tailed Weasel

Neogale frenata

Occasional in New Hampshire 26 sightings
Size 24.8 cm9.8 in Weight 170 g6 oz active day & night wetland

Sightings by month

Sorex cinereus, Harwich, Chatham, Ontario, Canada 1

Masked Shrew

Sorex cinereus

Common in New Hampshire 2,159 sightings
Size 6.9 cm2.7 in Weight 5 g0.2 oz active day & night grassland

Sightings by month

Cow moose standing in a marshy Alaska wetland

Moose

Alces alces

Common in New Hampshire 1,029 sightings
Size 2.4–3.1 m7.9–10.2 ft Weight 200–490 kg440.9–1080.3 lb active day & night wetland

Sightings by month

Mountain Lion (Puma concolor)

Mountain Lion

Puma concolor

Range-listed · no digitized records yet
Size 1–1.5 m3.3–5.1 ft Weight 36–120 kg79.4–264.6 lb active day & night montane forest
Muskrats resting on a floating log in open water

Muskrat

Ondatra zibethicus

Common in New Hampshire 191 sightings
Size 25–36 cm9.8–14.2 in Weight 0.6–2 kg1.3–4.4 lb active day & night wetland

Sightings by month

New England cottontail

New England Cottontail

Sylvilagus transitionalis

Occasional in New Hampshire 26 sightings
Size 38–43 cm15–16.9 in Weight 1–1.5 kg2.2–3.3 lb active dawn & dusk shrubland

Sightings by month

Deer Mouse (Peromyscus maniculatus) (9310532204)

North American Deermouse

Peromyscus maniculatus

Common in New Hampshire 2,805 sightings
Size 8–10 cm3.1–3.9 in Weight 21 g0.7 oz active by night river

Sightings by month

North American least shrew moving through short grass

North American Least Shrew

Cryptotis parvus

Marginal occurrence · 1 record
Size 5–8 cm2–3.1 in Weight 6 g0.2 oz active by night grassland
Erethizontidae Erethizon dorsatum 3.2

North American Porcupine

Erethizon dorsatus

Common in New Hampshire 981 sightings
Size 60–90 cm2–3 ft Weight 3.5–12 kg7.7–26.5 lb active by night mixed forest

Sightings by month

River Otter (Lontra canadensis)

North American River Otter

Lontra canadensis

Common in New Hampshire 247 sightings
Size 0.7–1.1 m2.2–3.5 ft Weight 5–15 kg11–33.1 lb active day & night river

Sightings by month

Illustration: northern bog lemmings (as Arvicola borealis) from John Woodhouse Audubon's 1845 Northern Meadow-Mouse plate

Northern Bog Lemming

Synaptomys borealis

Marginal occurrence · 2 records
Size 13 cm5.1 in Weight 21 g0.7 oz active day & night wetland
Hyperoodon ampullatus fin

Northern Bottlenose Whale

Hyperoodon ampullatus

Size 7–9.8 m23–32.2 ft Weight 5–7.5 kg11–16.5 lb active day & night deep ocean
Northern Flying Squirrel (Glaucomys sabrinus)

Northern Flying Squirrel

Glaucomys sabrinus

Occasional in New Hampshire 11 sightings
Size 25–37 cm9.8–14.6 in Weight 148 g5.2 oz active by night mixed conifer

Sightings by month

Hoary bat in flight against blue sky, wings spread to show its yellow throat patch and heavily frosted fur

Northern Hoary Bat

Lasiurus cinereus

Marginal occurrence · 2 records
Size 13–15 cm5.1–5.9 in Weight 26 g0.9 oz active by night cave
Northern myotis hanging head-down from a rock ceiling, long ears and tan fur visible

Northern Myotis

Myotis septentrionalis

Marginal occurrence · 2 records
Size 8.6 cm3.4 in Weight 6 g0.2 oz active by night coniferous forest
Northern Short-tailed Shrew (Blarina brevicauda)

Northern Short-tailed Shrew

Blarina brevicauda

Occasional in New Hampshire 108 sightings
Size 11.1 cm4.4 in Weight 21 g0.7 oz active day & night riparian

Sightings by month

Live Norway rat beside shallow water

Norway Rat

Rattus norvegicus

Occasional in New Hampshire 38 sightings
Size 15–28 cm5.9–11 in Weight 140–500 g0.3–1.1 lb active by night urban

Sightings by month

Red Fox (Vulpes vulpes)

Red Fox

Vulpes vulpes

Common in New Hampshire 402 sightings
Size 43 cm16.9 in Weight 5–10 kg11–22 lb active day & night desert

Sightings by month

Microtus chrotorrhinus

Rock Vole

Microtus chrotorrhinus

Occasional in New Hampshire 18 sightings
Size 11.5 cm4.5 in Weight 39 g1.4 oz active day & night coniferous forest

Sightings by month

Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Occasional in New Hampshire 17 sightings
Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz active by night river

Sightings by month

Smoky shrew moving through dense green grass

Smoky Shrew

Sorex fumeus

Rarely seen in New Hampshire 10 sightings
Size 7.4 cm2.9 in Weight 8 g0.3 oz active day & night river

Sightings by month

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in New Hampshire 283 sightings
Size 41–52 cm16.1–20.5 in Weight 1.4–1.6 kg3.2–3.4 lb active by night coniferous forest

Sightings by month

AI-generated image: Southern bog lemming alert among wet sedges and sphagnum at a bog edge. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Southern Bog Lemming

Synaptomys cooperi

Occasional in New Hampshire 15 sightings
Size 11.8 cm4.6 in Weight 35 g1.2 oz active day & night mixed conifer

Sightings by month

Southern Flying Squirrel-27527-1

Southern Flying Squirrel

Glaucomys volans

Occasional in New Hampshire 29 sightings
Size 17.1 cm6.7 in Weight 65 g2.3 oz active by night deciduous forest

Sightings by month

Southern red-backed vole feeding among sunflower seeds on snow

Southern Red-backed Vole

Clethrionomys gapperi

Common in New Hampshire 875 sightings
Size 12–16.5 cm4.7–6.5 in Weight 6–42 g0.2–1.5 oz active by night mixed forest

Sightings by month

Star-nosed mole's fleshy 22-ray nose organ fanned out, close-up macro

Star-nosed mole

Condylura cristata

Occasional in New Hampshire 16 sightings
Size 12.1 cm4.8 in Weight 52 g1.8 oz active day & night urban

Sightings by month

Mephitis mephitis in Dierenpark Zie-ZOO

Striped Skunk

Mephitis mephitis

Common in New Hampshire 218 sightings
Size 46.5–81.5 cm1.5–2.7 ft Weight 0.6–6.3 kg1.3–13.9 lb active by night grassland

Sightings by month

Tricolored Bat hibernating on a limestone mine wall

Tricolored Bat

Perimyotis subflavus

Marginal occurrence · 4 records
Size 7.7–8.9 cm3–3.5 in Weight 5–8 g0.2–0.3 oz active by night cave
Virginia Opossum clinging to a tree branch in a snowy winter woodland

Virginia Opossum

Didelphis virginiana

Common in New Hampshire 240 sightings
Size 40.8 cm16.1 in Weight 1.1–1.6 kg2.5–3.6 lb active by night river

Sightings by month

Little brown myotis roosting alertly on a wooden beam

Western Little Brown Myotis

Myotis lucifugus

Rarely seen in New Hampshire 4 sightings
Size 8–9.5 cm3.1–3.7 in Weight 6–13 g0.2–0.5 oz active by night cave

Sightings by month

White-footed mouse on a fallen log in leaf litter

White-footed Mouse

Peromyscus leucopus

Common in New Hampshire 2,824 sightings
Size 10.1 cm4 in Weight 20–30 g0.7–1.1 oz active by night urban

Sightings by month

White-tailed Deer (Odocoileus virginianus)

White-tailed Deer

Odocoileus virginianus

Common in New Hampshire 4,690 sightings
Size 0.9–2.2 m3.1–7.2 ft Weight 68–136 kg149.9–299.8 lb active day & night mixed forest

Sightings by month

Adult wild boar foraging in grass

Wild Boar

Sus scrofa

Marginal occurrence · 7 records
Size 85–90 cm2.8–3 ft Weight 40–50 kg88.2–110.2 lb active day & night lake

Sightings by month

Microtus pinetorum - crlevy - 550023152

Woodland Vole

Microtus pinetorum

Rarely seen in New Hampshire 6 sightings
Size 10.3 cm4.1 in Weight 26 g0.9 oz active day & night woodland

Sightings by month