Greater Siren (Siren lacertina) in natural habitat
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Greater Siren

Scientific Name: Siren lacertina
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IUCN Conservation Status: Least Concern

The Greater Siren (Siren lacertina) is cataloged as Least Concern on the official IUCN Red List of Threatened Species.

⚡ Key Facts & Quick Answers (AEO Summary)

  • Taxonomic Class: Amphibians (Amphibia)
  • Dietary Niche: Carnivore (Crayfish, worms, snails, aquatic insects)
  • Max Speed: 3 km/h (1.9 mph) swimming
  • Adult Weight: 500 - 1,000 grams
  • Typical Lifespan: 15 - 25 years
  • Primary Habitat: Muddy swamps, slow weed-choked streams, ditches
  • Native Region: Southeastern United States
  • IUCN Red List: Least Concern

📊 Physical & Biological Metrics

Class
Amphibians (Amphibia)
Diet Type
Carnivore (Crayfish, worms, snails, aquatic insects)
Habitat
Muddy swamps, slow weed-choked streams, ditches
Lifespan
15 - 25 years
Adult Weight
500 - 1,000 grams
Top Speed
3 km/h (1.9 mph) swimming
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Geographic Range & Distribution
Southeastern United States
Native Biome: Muddy swamps, slow weed-choked streams, ditches

🧬 Scientific Taxonomy & Biological Classification

Kingdom Animalia
Phylum Chordata
Class Amphibia
Order Urodela
Family Sirenidae
Genus Siren
Species Binomial Siren lacertina

📖 1. Species Overview

The Greater Siren is a giant, eel-like aquatic salamander growing up to 95 cm long. They lack hind legs entirely, possessing feathery red external gills, tiny front legs, and horny beak jaws.

🦿 2. Physical Appearance, Anatomy & Adaptations

Long dark grey eel-like body, bushy red external gills, tiny front legs with four toes, and no hind legs.

🗺️ 3. Habitat, Geographic Distribution & Territorial Range

Strictly aquatic. During severe droughts, they cocoon themselves in mud and mucus for up to 3 years.

🥩 4. Diet, Feeding Strategy & Hunting Tactics

Suction feed on river bottoms, crushing crayfish and snails.

🐣 5. Reproduction, Lifecycle & Social Hierarchy

Lay hundreds of eggs in underwater mud nests guarded by the female.

🛡️ 6. Conservation Status, Population Threats & Protection

Least Concern, though threatened by wetland drainage.

💡 Fascinating Facts & Trivia

  • Greater sirens can survive severe droughts by secreting a cocoon of mud and mucus, aestivating for up to 3 years.
  • They have no hind legs whatsoever, possessing only tiny front arms.

❓ Frequently Asked Questions (FAQ)

Direct authoritative answers regarding the biology, feeding habits, and habitat of the Greater Siren.

What is the scientific taxonomy of the Greater Siren? ▼

The Greater Siren is scientifically classified as Siren lacertina. It belongs to the genus Siren within the family Sirenidae, class Amphibia, and phylum Chordata.

Where does the Greater Siren live in the wild? ▼

In the wild, Greater Sirens inhabit Muddy swamps, slow weed-choked streams, ditches. Their native geographic range primarily spans Southeastern United States.

What do Greater Sirens eat in their natural habitat? ▼

The Greater Siren is classified as a Carnivore. It feeds primarily on specialized nutrients suited to its ecological niche in Muddy swamps, slow weed-choked streams, ditches.

How fast can a Greater Siren move, and what is its typical size? ▼

A Greater Siren can achieve top speeds of 3 km/h (1.9 mph) swimming and weighs approximately 500 - 1,000 grams. Its expected natural lifespan is 15 - 25 years.

What is the IUCN conservation status of the Greater Siren? ▼

The Greater Siren (Siren lacertina) is currently designated as Least Concern on the IUCN Red List of Threatened Species.

Cite this Article

FaunaWiki Zoological Database (2026). "Greater Siren (Siren lacertina) Species Profile."

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