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What the sources say

GroundhogMarmota monax

Every figure, record and mechanism on the Groundhog profile was written from a source, and this is the working table behind it: 42 claims checked word for word against these sources. The left column is what the page says. The right column is the source's own words, copied, not paraphrased; a ... marks a cut and[brackets] an insertion. Open any source and check it yourself.

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Source
01

Cassola 2016

Cassola (2016). Marmota monax. The IUCN Red List of Threatened Species 2016: e.T42458A115189992.

The page saysLeast Concern
The source saysLeast ConcernNote: conservationStatus; the quote is the category line from GBIF's copy of the Red List, assessment 2016
The page saysThe Red List rates it Least Concern.
The source saysIUCN Red List category: Least Concern (LC).

Source
02

Kerwin & Maslo

Kerwin & Maslo. Ecology and Management of the Groundhog (Marmota monax). Rutgers New Jersey Agricultural Experiment Station.

The page saysThe largest marmot in its range, a tunnelling rodent that sleeps through the winter and warns its neighbours with a shrill whistle.
The source saysare the largest marmot species in the range, weighing 5-15 lbs. and measuring 16-26 inches longNote: tagline; winter sleep and whistle claimed below
The page saysThe groundhog is the largest marmot in its range. It weighs 5 to 15 pounds and measures 16 to 26 inches long.
The source saysare the largest marmot species in the range, weighing 5-15 lbs. and measuring 16-26 inches long
The page saysIt belongs to the squirrel family, and you can find it across much of Canada and the eastern United States.
The source saysGroundhogs can be found across much of Canada and the eastern United States
The page saysIt belongs to the squirrel family
The source saysbelong to the squirrel family Sciuridae
The page saysOpen clearings, woodland edges, roadsides, fields and stream banks across much of Canada and the eastern United States
The source saysincluding open clearings, woodland edges, roadsides, fields, and riparian areasNote: stats.habitat
The page saysDigs tunnel networks up to 30 feet long, with separate chambers for hibernation
The source saysgroundhogs maintain complex networks of tunnels that can extend 4 to 5 feet beneath the ground surface and up to 30 feet in lengthNote: stats.superpower
The page saysWith them it digs tunnel networks that can reach 4 to 5 feet down and up to 30 feet in length.
The source saysgroundhogs maintain complex networks of tunnels that can extend 4 to 5 feet beneath the ground surface and up to 30 feet in length
The page saysIts tools are long, curved claws and strong limbs.
The source saysUsing their long, curved claws and strong limbs
The page saysA burrow often has several entrances and separate chambers for hibernation, which is deep winter sleep.
The source saysBurrows often contain multiple access and egress points, as well as separate chambers for hibernation
The page saysit has big front teeth, called incisors, that grow continuously.
The source saysgroundhogs have large incisors, which grow continuously to compensate for the extreme wear and tear they experience from grazing vegetation and gnawing through roots while excavating burrows
The page saysGrazing and gnawing through roots wear them down.
The source saysextreme wear and tear they experience from grazing vegetation and gnawing through roots while excavating burrows
The page saysGroundhogs are surprisingly sanitary, even dedicating separate chambers for defecation.
The source saysGroundhogs are surprisingly sanitary, even dedicating separate chambers for defecation!Note: blockquote
The page saysIn summer, a groundhog can eat up to 1.5 pounds of plants a day.
The source saysThey can eat up to 1.5 lbs. of vegetation per day during the summer
The page saysThat adds 11.5 to 20 grams of body weight daily, depending on sex and age.
The source saysleading to a 11.5-20-gram weight gain per day, depending on sex and age
The page saysIn spring it favours clover
The source saysIn spring groundhogs favor species of cloverNote: clover; later foods next claim
The page sayslater in the growing season it seeks out berries, corn, tomatoes, alfalfa and apples from fields and gardens.
The source saysgroundhogs will seek out various berries, corn, tomatoes, alfalfa, and apples from cultivated fields and backyard gardens
The page saysIt will occasionally eat bird eggs, beetles, snails and grasshoppers.
The source saysgroundhogs will occasionally consume bird eggs and invertebrates including beetles, snails, and grasshoppers
The page saysPlants such as clover, berries, corn and apples, and occasionally bird eggs, insects and snails
The source saysAlthough they are primarily vegetarians, groundhogs will occasionally consume bird eggs and invertebrates including beetles, snails, and grasshoppers.Note: stats.diet; foods above
The page saysHibernation starts in October or November.
The source sayswhich begins in October or November
The page saysBoth sexes wake briefly in February, when males claim territories and look for females.
The source saysMale and female groundhogs arouse from hibernation for short periods in February, which allows males to establish territories and search for females
The page saysThey go back to sleep and finally emerge in March.
The source saysBoth sexes then return to their respective burrows for additional deep-sleep periods before finally emerging in March
The page saysA female has one litter of 2 to 6 young a year.
The source saysFemales produce one litter of 2-6 young
The page saysThe kits are born blind and hairless.
The source saysKits are born blind and hairless
The page saysAfter about 2 months of care they leave to find their own territories.
The source saysAfter about 2 months of care, the juvenile groundhogs leave their natal site to find their own territories.
The page saysGroundhogs are prey for coyotes, bobcats, eagles, hawks, owls and weasels.
The source saysGroundhogs are also an important prey item for coyotes, bobcats, eagles, hawks, owls, and weasels.
The page saysIn the wild a groundhog lives 4 to 6 years on average.
The source saysGroundhogs live an average of 4 to 6 years in the wild
The page saysGroundhogs are the best non-human model for studying hepatitis B, a virus that damages the human liver.
The source saysGroundhogs serve as the best non-human model for studying the hepatitis B virus, which causes liver damage and liver cancer in humans if left untreated.
The page saysThey can be infected with a similar disease called woodchuck hepatitis virus. Studying infected groundhogs helps researchers understand the virus and develop new treatments for people with hepatitis B.
The source saysGroundhogs can be infected with a similar disease known as woodchuck hepatitis virus (WHV), which also causes liver cancer. By studying groundhogs infected with WHV, researchers can better understand the pathogenesis of the virus and develop new therapies to treat humans with hepatitis B.
The page saysOnce abandoned, these burrows give shelter and breeding space to many other animals, including rabbits, raccoons, foxes, river otters and snakes.
The source saysAbandoned groundhog burrows are used by many other wildlife species for shelter and breeding, including cottontail rabbits, raccoons, foxes, river otters, eastern chipmunks, and a wide variety of small mammals, snakes, and birds.
The page saysBoth names, plus whistlepig and land beaver, belong to *Marmota monax*.
The source saysKnown by several common names such as whistlepig, land beaver, and woodchuck
The page saysGerman migrants brought the tradition to Pennsylvania in the mid-1800s
The source saysGerman migrants brought the tradition of Groundhog Day to Pennsylvania in the mid-1800s.
The page saysin Europe the animal was originally a badger or a hedgehog.
The source says(originally a badger or hedgehog in Europe)
The page saysIt is a legend.
The source saysAccording to the myth, if a groundhog (originally a badger or hedgehog in Europe) emerges from its den and sees its shadow, then six more weeks of winter lie ahead.Note: FAQ

Source
03

Tobias

Tobias. Marmota monax (woodchuck). Animal Diversity Web.

The page saysA threatened groundhog often defends itself with its teeth and gives a shrill whistle.
The source saysThey often use their teeth to defend themselves and produce a shrill whistle when threatened.
The page saysThe whistle also warns other groundhogs, especially juveniles.
The source saysWhistles also serve as a warning call to conspecifics, especially juveniles.
The page saysTo avoid predators it climbs trees and stops to look up while feeding.
The source saysWoodchucks avoid predators by climbing trees and looking up periodically while feeding.
The page saysWild groundhogs average 4 to 6 years, but predators and disease mean many do not live past age 3.
The source saysWoodchucks live 4 to 6 years in the wild but, due to predation and disease, often do not live past age 3.Note: FAQ
The page says"Woodchuck" comes from a Native American word, which one account translates roughly as "the digger".
The source saysThe word "woodchuck" is a misinterpretation of their Native American name "wuchak", which roughly translates as "the digger".
The page saysOne account suggests the legend began because groundhogs often go back into hibernation after leaving their dens too early.
The source saysThe legend of Groundhog Day is likely due to the fact that woodchucks often re-enter hibernation after emerging from their dens prematurely.Note: FAQ
The page saysA threatened groundhog gives a shrill whistle that also warns other groundhogs
The source saysThey often use their teeth to defend themselves and produce a shrill whistle when threatened.Note: vibe.reason

How the table was made: a writer drafted the profile from these sources and logged each claim with its quote, a reviewer with nothing but this table checked every sentence said no more than its quote, and a script confirmed each quote appears word for word in the source. The method is in the site'sAbout page.