CreatureData

Marsh deer

Blastocerus dichotomus (Illiger, 1815)

VUVulnerablemammals

The marsh deer (Blastocerus dichotomus) is a mammal in the family Cervidae, order Artiodactyla, subfamily Capreolinae and tribe Odocoileini. It is a large, terrestrial herbivore with a nocturnal activity pattern, with an adult body mass of 86.67 kg and up to 102.5 kg.

Marsh deer (Blastocerus dichotomus)
Photo: Phillip Capper from Wellington, New Zealand · CC BY 2.0 · Wikimedia Commons

Quick facts about the marsh deer

Gestation lasts 270.6 days, ranging from 255 to 271 days, and females have 1 young per litter and 1 litter per year. The IUCN Red List classifies the marsh deer as Vulnerable (VU), a threatened category, and its lifespan is given as 13.7 years.

Weight
86.7 kg – 102.5 kgsrc for Weight
Length
Not recorded
Lifespan
13.7 yearssrc for Lifespan
Diet
Herbivoresrc for Diet
Main food
Not recorded
Habitat
Not recorded
Gestation
255 days – 271 dayssrc for Gestation
Young per litter or clutch
1src for Young per litter or clutch
Litters or clutches a year
1src for Litters or clutches a year
Active
At night (nocturnal)src for Active
Lifestyle
Terrestrialsrc for Lifestyle
Conservation status
Vulnerable (IUCN)src for Conservation status
Countries on record
Not recorded

Photos of the marsh deer

Only freely licensed photos are shown. Each carries its creator and licence.

Where does the marsh deer live?

Not recorded

What is the marsh deer?

Quoted from WikipediaCC BY-SA 4.0

The marsh deer (Blastocerus dichotomus) is a species of deer native to South America. It is the largest living species of South American deer. It is the only species in the genus Blastocerus.

From the Wikipedia article “Marsh deer” (en.wikipedia.org/w/index.php?title=Marsh_deer&oldid=1373111878), by Wikipedia contributors, licensed under CC BY-SA 4.0 (creativecommons.org/licenses/by-sa/4.0). This block is kept separate from our own text.

Is the marsh deer endangered?

The marsh deer is listed as Vulnerable on the IUCN Red List: it faces a high risk of extinction in the wild.

  1. LCLeast Concern
  2. NTNear Threatened
  3. VUVulnerable
  4. ENEndangered
  5. CRCritically Endangered
  6. EWExtinct in the Wild
  7. EXExtinct

Category via Wikidata (CC0). Find the full assessment on the IUCN Red List. See all Vulnerable species.

How is the marsh deer classified?

  1. kingdomAnimalia
  2. phylumChordata
  3. classMammalia
  4. orderArtiodactyla
  5. familyCervidae
  6. genusBlastocerus
  7. SpeciesBlastocerus dichotomus (Illiger, 1815)

Synonyms Cervus dichotomus, Cervus paludosus, Cervus palustris, Mazama furcata

Other names and names in other languages (26)
  • أيل المستنقعArabic
  • venáu los pantanosAsturian
  • jelenec bahenníCzech
  • SumphjortDanish
  • SumpfhirschGerman
  • Ελάφι των βάλτωνGreek
  • Βλαστόκερως η διχοτόμοςGreek
  • agus pelotudoSpanish
  • Ciervo de los PantanosSpanish
  • Ciervo MarismeSpanish
  • Ciervo MarismeñoSpanish
  • SoohirvEstonian
  • SuohirviFinnish
  • suokaurisFinnish
  • Cerf des maraisFrench
  • Cervo dos pantanosGalician
  • Lápi szarvasHungarian
  • アメリカヌマジカJapanese
  • 늪사슴Korean
  • MoerashertDutch
  • jeleniak bagiennyPolish
  • Cervo do PantanalPortuguese
  • Cervo-do-PantanalPortuguese
  • Болотный оленьRussian
  • Bataklık GeyiğiTurkish
  • 沼澤鹿Chinese

Catalogue of LifeWikipediaiNaturalistWikidataIUCN Red List

Relatives of the marsh deer

Other species in the same family Cervidae.

LC, Least Concern
Moose (Alces alces)

Moose

Alces alces

Cervidae

VU, Vulnerable
Reindeer (Rangifer tarandus)

Reindeer

Rangifer tarandus

Cervidae

LC, Least Concern
Red deer (Cervus elaphus)

Red deer

Cervus elaphus

Cervidae

LC, Least Concern
Roe deer (Capreolus capreolus)

Roe deer

Capreolus capreolus

Cervidae

LC, Least Concern
Elk (Cervus canadensis)

Elk

Cervus canadensis

Cervidae

CompareMarsh deer vs MooseMarsh deer vs ReindeerMarsh deer vs Red deerMarsh deer vs Roe deer

Common questions

Each answer is written from the sourced facts on this page, and only where they hold the answer.

What kind of animal is the marsh deer?

The marsh deer is a mammal in the family Cervidae, order Artiodactyla. It belongs to the subfamily Capreolinae and the genus Blastocerus.

How heavy is the marsh deer?

The marsh deer has an adult body mass of 86.67 kg, with values up to 102.5 kg reported. It falls in the large size class.

What does the marsh deer eat?

The marsh deer is a herbivore.

Is the marsh deer endangered?

The marsh deer is listed as Vulnerable (VU) on the IUCN Red List, which is a threatened category.

How long does the marsh deer live?

The lifespan of the marsh deer is given as 13.7 years.

How many young does the marsh deer have?

The marsh deer has 1 young per litter and 1 litter per year, after a gestation of 270.6 days.

Is the marsh deer nocturnal?

Yes, the marsh deer has a nocturnal activity pattern and a terrestrial lifestyle.

Sources and how to cite this page

Data as of 2026-11-11. How this page is put together.

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APA

CreatureData. (2026). Marsh deer (Blastocerus dichotomus). Retrieved from https://creaturedata.com/animals/marsh-deer

MLA

“Marsh deer (Blastocerus dichotomus).” CreatureData, 2026, https://creaturedata.com/animals/marsh-deer.

BibTeX
@misc{marsh_deer_2026,
  title = {Marsh deer (Blastocerus dichotomus)},
  author = {{CreatureData}},
  year = {2026},
  url = {https://creaturedata.com/animals/marsh-deer},
  note = {Data as of 2026-11-11}
}