Marsh deer
Blastocerus dichotomus (Illiger, 1815)
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.

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?
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.
- LCLeast Concern
- NTNear Threatened
- VUVulnerable
- ENEndangered
- CRCritically Endangered
- EWExtinct in the Wild
- EXExtinct
Category via Wikidata (CC0). Find the full assessment on the IUCN Red List. See all Vulnerable species.
How is the marsh deer classified?
- kingdomAnimalia
- phylumChordata
- classMammalia
- orderArtiodactyla
- familyCervidae
- genusBlastocerus
- 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
Relatives of the marsh deer
Other species in the same family Cervidae.

Moose
Alces alces

Reindeer
Rangifer tarandus

Red deer
Cervus elaphus

Roe deer
Capreolus capreolus

European fallow deer
Dama dama

Elk
Cervus canadensis
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.
- An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles · CC0 1.0 · E096-269
Myhrvold, N.P., Baldridge, E., Chan, B., Sivam, D., Freeman, D.L. & Ernest, S.K.M. (2015) An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96: 3109. https://doi.org/10.1890/15-0846R.1. Data: https://doi.org/10.6084/m9.figshare.3563457.v1 - Catalogue of Life eXtended Release · CC BY 4.0 · 2026-10-16 XR
Catalogue of Life (2026). Catalogue of Life eXtended Release, version 2026-10-16 XR. Catalogue of Life Foundation, Amsterdam, Netherlands. https://doi.org/10.48580/dgzlf - Wikimedia Commons · per file (CC0 / public domain / CC BY green, CC BY-SA amber, anything else not displayed) · 2026-11-11
Wikimedia Commons contributors. Wikimedia Commons. https://commons.wikimedia.org (each file credited to its author under its own licence). - EltonTraits 1.0: species-level foraging attributes of the world's birds and mammals · CC0 1.0 · 1.0
Wilman, H., Belmaker, J., Simpson, J., de la Rosa, C., Rivadeneira, M.M. & Jetz, W. (2014) EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95: 2027. https://doi.org/10.1890/13-1917.1. Data: https://doi.org/10.6084/m9.figshare.3559887.v1 - Wikidata · CC0 1.0 · 2026-11-11
Wikidata contributors. Wikidata. https://www.wikidata.org (data retrieved via the Wikidata Query Service). - Wikipedia (English) · CC BY-SA 4.0 · 2026-11-11
Wikipedia contributors. Wikipedia, The Free Encyclopedia. https://en.wikipedia.org (text under CC BY-SA 4.0; each block names its article and revision).
Embed a card for this animal on your own site
Copy this code. The card shows the photo with its credit, key facts and a link back to this page.
CreatureData. (2026). Marsh deer (Blastocerus dichotomus). Retrieved from https://creaturedata.com/animals/marsh-deer
“Marsh deer (Blastocerus dichotomus).” CreatureData, 2026, https://creaturedata.com/animals/marsh-deer.
@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}
}