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  1. Home
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  3. Diamondback Terrapin

One of the 41 turtles and tortoises on WAnimals

Reptiles · Testudines · Emydidae

Diamondback Terrapin

Malaclemys terrapin

Vulnerable

At high risk of extinction in the wild over the medium term.

Spotted something wrong?

It is the only turtle in the world that lives exclusively in brackish water, a niche unique among the chelonians. As in many turtles, the sex of the hatchlings depends on the nest's incubation temperature.

Weight

720 g on average

Size

10 cm – 23 cm

Life expectancy

30 years

Diet

Carnivore

Feeds mainly on other animals.

Activity

Diurnal

Active mainly during the day.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

OceanFreshwater
2countries5parks2dive sites6same family

Fun facts

  • It is the only turtle in the world that lives entirely in brackish water.
  • The sex of the hatchlings depends on the nest's incubation temperature.
  • Its jaws crush snails, molluscs and crustaceans on specialised ridges.

Life cycle and biology

Skeleton type
Vertebrate - bony skeleton with a fused shell (reptile)
Habitat and environment
Salt marshes and brackish water of the Atlantic and Gulf coasts of the United States, from Cape Cod to Texas
Birth weight
6-10 grams; ~1-1.5 inches long on hatching
Size at birth
2.5 - 3.8 cm of carapace length at hatching
Sexual maturity
Male: 2.5-8 years | Female: 6-10 years
Gestation / incubation
60-104 days, depending on the temperature and depth of the nest
Litter / clutch size
4 to 22 eggs per clutch, with several clutches a year
Life expectancy in captivity
An unconfirmed anecdotal record of over 40 years in captivity

Sources consulted: AnAge · NCpedia · Conserve Wildlife Foundation NJ · Animal Spot · Animal Diversity Web · iNature · Animalia.bio · UFL Extension Blog

Where to find it

Loading map…

The pins mark the parks and dive sites where its presence is documented.

Where to see it

Parks and dive sites where this species has been documented.

Related species

Other species in the catalogue with the most in common with Diamondback Terrapin — same habitat, park, country, tags or family.

Same taxonomic family
Shares a park
Shares a park
Shares a park
Shares a park
Same taxonomic family

How to help

The diamondback terrapin is classified as vulnerable. Organisations such as the IUCN, WWF and the Wildlife Conservation Society work specifically on its conservation and that of its habitat; looking into their programmes is a good starting point if you want to get involved.

It's documented in 4 protected areas — one reason why protecting these places matters for its conservation.

Keep exploring

Based on what we already know about diamondback terrapin.

Share an experience, a fun fact or a tip for seeing the diamondback terrapin.
See full glossary
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See its range on the interactive map→
EvergladesUnited States
AcadiaUnited States
BiscayneUnited States
Assateague IslandUnited States
Cape CodUnited States
Blue Heron BridgeUnited States
Gray's ReefUnited States
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Megalops atlanticus

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Blanding's Turtle

Emydoidea blandingii

CountriesUnited States
ParksEvergladesUnited States
TagsCarnivore
Carnivore
Diurnal
Solitary
Vulnerable
Near Threatened
Reptile
Ocean
Freshwater
United States
Bermuda