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  3. Greater Siren

Amphibians · Caudata · Sirenidae

Greater Siren

Siren lacertina

Least Concern

The species is abundant and widely distributed; it faces no significant short-term risk.

Spotted something wrong?

The greater siren is an eel-like amphibian of almost a metre in length that retains its external gills for life, has tiny front legs and no hind legs at all. It is entirely aquatic and, when its pool dries out, it buries itself in the mud and forms a cocoon of mucus, surviving that way for more than a year without water.

Size

50 cm – 97 cm

Life expectancy

25 years

Diet

Carnivore

Feeds mainly on other animals.

Activity

Nocturnal

Active mainly at night.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

Freshwater
1countries3parks3dive sites

Fun facts

  • It survives droughts inside a cocoon: it buries itself in the mud and secretes a hardened layer of mucus that wraps it completely, holding in moisture for more than a year until the water returns.
  • It has no hind legs and its front legs are tiny: it moves by wriggling like an eel, and its appearance led the first naturalists to classify it wrongly among the fishes.
  • In 2018 a sister species was described in Alabama, nicknamed the leopard siren, which turned out to be one of the largest vertebrates discovered in the United States in a century.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (amphibian)
Habitat and environment
Pools, canals, marshes and shallow water with dense vegetation in the south-eastern United States
Sexual maturity
3 years
Gestation / incubation
Larval development in water
Litter / clutch size
500

Sources consulted: Wikipedia (es): Siren lacertina

Where to find it

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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 Greater Siren — same habitat, park, country, tags or family.

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See full glossary
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See its range on the interactive map→
EvergladesUnited States
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BiscayneUnited States
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CountriesUnited States
ParksEvergladesUnited States
TagsCarnivore
Carnivore
Nocturnal
Solitary
Amphibian
Freshwater
United States