Endangered SpeciesA branch of The Humanity Project

Reptiles and Amphibians

Hawksbill Sea Turtle

Eretmochelys imbricata

A coral reef turtle hunted for centuries for its patterned shell, sold as tortoiseshell, and still critically endangered worldwide.

Illustration of a hawksbill sea turtle ambassador — narrow pointed beak, overlapping amber and brown patterned shell scutes with a serrated rear edge — swimming beside a sponge-covered coral reef.
Illustrated Species Ambassador — original artwork, not a photograph

Illustrated Species Ambassador

Amber — Hawksbill Sea Turtle

I'm Amber, an illustrated ambassador for the hawksbill sea turtle. My shell is the reason I was hunted for centuries. It was sold as tortoiseshell.

One fact worth knowing
The hawksbill is one of very few animals that eats sponges in quantity, which stops sponges from crowding reef-building corals out of space.
What I depend on
I depend on healthy sponge-bearing coral reefs and on small undisturbed nesting beaches.
My greatest threat
My greatest threats are the shell trade and the loss of coral reefs.
One way you can help
Never buy tortoiseshell — if a souvenir looks like polished turtle shell, assume that is what it is — and use reef-safe sunscreen without touching or standing on coral.
Global species at risk →

This ambassador is an original illustration created for this project. It is an educational character, not a documentary image, and its statements follow the sourced record on this page. Artwork and rights record

Why this species matters

Hawksbills keep sponges in check so corals can hold their place on the reef. Removing them changes the reef itself — this is a species whose feeding habit maintains a habitat that thousands of other species depend on.

If it disappears: Sponge overgrowth would accelerate coral reef decline, compounding losses already driven by warming and bleaching.

Cultural and regional note: Tortoiseshell from hawksbill scutes was traded for centuries for combs, jewelry, and inlay; CITES prohibits this trade internationally, but illegal sales persist in tourist markets.

Conservation status

IUCN Red List
Critically EndangeredLast verified 2026-09-08
U.S. Endangered Species Act
EndangeredListed 1970.Last verified 2026-09-08
CITES
Appendix ILast verified 2026-09-08

Population

Global nesting is estimated in the range of roughly 20,000–25,000 nesting females, with a documented global decline exceeding 80 percent over three generations.

Trend: Decreasing

As reported: IUCN Red List assessment; NOAA Fisheries status reporting

Source: IUCN Red List; NOAA Fisheries

Uncertainty: Sea turtle populations are counted as nesting females rather than total individuals, because males and juveniles are not reliably countable.

Historical: Millions of hawksbills were killed for the tortoiseshell trade over several centuries, with Japan alone importing shell from hundreds of thousands of turtles in the twentieth century.

Fragmentation: Some regional nesting populations are increasing while others continue to decline.

Range and distribution

Historic range: Tropical and subtropical reefs of the Atlantic, Indian, and Pacific Oceans.

Current range: Same broad range with sharply reduced numbers and lost nesting beaches.

Migration: Long-distance movement between foraging reefs and nesting beaches.

Range contraction: Extirpated from a number of historic nesting beaches.

Regions occupied

  • Caribbean
  • Gulf of Mexico
  • Western Atlantic
  • Indo-Pacific
  • Indian Ocean
  • Coral Triangle

Habitat

Primary habitat: Coral reefs, rocky outcrops, and sponge-rich hard-bottom habitat.

Breeding habitat: Nests on small, sandy tropical beaches, often under vegetation.

Feeding habitat: Feeds on sponges within reef systems.

Critical habitat: Critical habitat designated around Mona and Monito Islands, Puerto Rico.

Habitat dependencies

  • Healthy sponge-bearing coral reefs
  • Undisturbed small nesting beaches

Biology and ecology

One of the few animals that eats sponges in quantity, preventing sponges from outcompeting reef-building corals for space.

Important adaptations: Narrow, hawk-like beak for extracting sponges from reef crevices; overlapping, patterned scutes.

Size
Shell length about 25–35 inches.
Weight
Roughly 100–150 pounds.
Lifespan
Estimated 50 years or more.
Diet
Primarily sponges, along with anemones, jellyfish, and algae.
Reproduction
Nests at night on tropical beaches.
Offspring
Roughly 130–160 eggs per clutch, several clutches in a nesting season.
Breeding frequency
Nests every two to four years.
Age at maturity
Estimated 20–35 years.

Primary threats

  • Illegal wildlife trade

    Shell is still sold as tortoiseshell jewelry and curios despite an international ban.

  • Habitat loss

    Coral reef degradation and bleaching remove the sponge-rich habitat hawksbills feed in.

  • Bycatch

    Entanglement in gillnets, longlines, and trap lines drowns turtles of all ages.

  • Egg harvest

    Nest poaching continues in several range countries.

  • Plastic debris

    Ingestion and entanglement kill turtles and hatchlings.

  • Coastal development

    Beach construction and lighting eliminate and disorient nesting activity.

  • Ocean warming

    Warmer sand skews hatchling sex ratios toward females, and warming drives coral bleaching.

Conservation and recovery

Programs and efforts

  • CITES Appendix I prohibition on international shell trade
  • NOAA Fisheries and USFWS joint recovery plans for Atlantic and Pacific populations
  • Nesting beach patrols and hatchery programs across the Caribbean and Indo-Pacific
  • Reef protection and marine protected area networks

Protected areas

  • Mona and Monito Islands, Puerto Rico
  • Buck Island Reef National Monument
  • Great Barrier Reef Marine Park
  • Caribbean marine protected areas

Legal protections

  • Endangered Species Act
  • CITES Appendix I
  • National protection across most range states

Measurable progress

  • Some Caribbean and Indian Ocean nesting populations have increased under sustained beach protection
  • Japan ended legal tortoiseshell imports in the 1990s

Continuing challenges

  • Persistent illegal shell markets
  • Coral reef decline is accelerating
  • Long maturation means recovery takes decades

How people can help

What individuals can do

  • Never buy tortoiseshell products; if a souvenir looks like polished turtle shell, assume it is
  • Use reef-safe sunscreen and avoid touching or standing on coral
  • Report nesting turtles and disoriented hatchlings rather than intervening

What communities can do

  • Support marine protected areas and reef restoration
  • Back dark-sky beachfront lighting rules

Educational actions

  • Teach travelers to recognize and refuse tortoiseshell items

Habitat support

  • Support coral reef restoration and water quality improvement near reefs

Organizations and programs to learn about

  • NOAA Fisheries
  • IUCN SSC Marine Turtle Specialist Group
  • regional sea turtle conservation networks

Educational notes

  • A species whose diet — sponges — is what makes it ecologically essential.
  • Connects tourism purchasing decisions directly to a critically endangered animal.

Sources and references