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Meet the Seven Sea Turtle Species

There are seven species of sea turtles, which are marine reptiles that need to breathe air to survive. Six of the seven species are found in US waters, and the flatback turtle is only found in the Western Indo-Pacific. Most of their lives are spent at sea, with some species diving to depths of 3000 feet (900 meters). They return to the shore to lay eggs, often making long journeys to go to specific beaches year after year. 

Their wide-reaching movement and the small amount of time they spend on land means that it is hard to measure just how many sea turtles remain, or how many there used to be. (One estimate is that millions of green sea turtles were in the Caribbean at the time of Christopher Columbus.) Now all six of the species found in US waters are listed as endangered under the Endangered Species Act, and those six are also found on the IUCN Red List where their listings range from Vulnerable to Critically Endangered. They have many human-induced threats including entanglement in fishing gear, marine debris, coastal habitat destruction, poaching of adults and eggs, and climate change.

There are sea turtle conservation successes, as well. Off the coast of Mexico, one community is hanging lights on their fishing nets so turtles can avoid them. They've found a 50 percent reduction in turtle catch at night, while the fish catch has actually gone up. Turtle Excluder Devices (TEDs) also help to prevent sea turtles from getting caught in shrimp trawling gear.  

Tags: Sea turtles
PreviewGreen turtles (Chelonia mydas) live in the warm coastal waters of tropical and subtropical oceans. Adults sometimes eat sponges, salps (floating jelly-like animals), and jellyfish, but they feed mostly on plants, like seagrass and algae. The pigment f
Preview Kemp’s ridley turtles (Lepidochelys kempii) are the smallest sea turtles, weighing only 100 lbs (45 kg). Adults spend most of their time in shallow coastal areas in places with mud, sand, or gravel bottoms—often in seagrass beds. They eat swimming crab
Preview Every year, at the same place and time, thousands of female Kemp's ridley sea turtles come ashore to nest and lay their eggs on the beach. This mass nesting event is known as an arribada, meaning “arrival by sea” in Spanish.
Preview Hawksbill turtles (Eretmochelys imbricata) are small to medium-sized turtles, but can get as large as 200 lbs (91 kg). Adults live among healthy coral reef communities, feeding primarily on sponges, but they also eat other invertebrates like sea cucumbers,
Preview Leatherback turtles (Dermochelys coriacea) are the largest sea turtles, growing as long as six and a half feet (2 m) and weighing some 2,000 pounds (900 kg). They’re unlike the other marine turtles in two important ways: they have a thick leathery carapa
Preview Loggerhead turtles (Caretta caretta) are named for their large heads and strong jaws, which allow them to eat prey with hard shells, like big marine snails. They live throughout the world’s warm tropical and subtropical oceans. They live off-shore when t
Preview Olive ridley turtles (Lepidochelys olivacea) are the smallest marine turtle, living in warm waters close to shore as adults. Female olive ridleys take part in mass nestings that can involve 150,000 individual turtles crawling up a beach at night to find a
Preview Unlike the other six species of marine turtle, the Australian flatback (Natator depressus) has a very limited distribution, found only from northern Australia to Papua New Guinea/Indonesia and it only breeds in Australia. Flatback turtles tend to spend mos
PreviewGreen turtles (Chelonia mydas) live in the warm coastal waters of tropical and subtropical oceans. Adults sometimes eat sponges, salps (floating jelly-like animals), and jellyfish, but they feed mostly on plants, like seagrass and algae. The pigment f

Green Turtle

Credit: Flickr user WLA

Green turtles (Chelonia mydas) live in the warm coastal waters of tropical and subtropical oceans. Adults sometimes eat sponges, salps (floating jelly-like animals), and jellyfish, but they feed mostly on plants, like seagrass and algae. The pigment from this green diet colors their fat, giving them their common name.

Populations of female nesting green sea turtles are estimated to have dropped by 48% to 65% in the past 100 to 150 years. However, recent studies show that marine protected areas are benefitting the turtles. 

PreviewKemp’s ridley turtles (Lepidochelys kempii) are the smallest sea turtles, weighing only 100 lbs (45 kg). Adults spend most of their time in shallow coastal areas in places with mud, sand, or gravel bottoms—often in seagrass beds. They eat swimming crab

Kemp's Ridley Turtle

Credit: Terry Ross (Flickr user qnr)

Kemp’s ridley turtles (Lepidochelys kempii) are one of the smallest sea turtles, weighing only 100 lbs (45 kg). Adults spend most of their time in shallow coastal areas in places with mud, sand, or gravel bottoms—often in seagrass beds. They eat swimming crabs, jellyfish and a variety of mollusks. This picture shows a female returning to the sea after laying her eggs in the sandy beach. 

PreviewEvery year, at the same place and time, thousands of female Kemp's ridley sea turtles come ashore to nest and lay their eggs on the beach. This mass nesting event is known as an arribada, meaning “arrival by sea” in Spanish.

Kemp's Ridley Nesting "Arribada"

Credit: Toni Torres

Every year, at the same place and time, thousands of female Kemp's ridley sea turtles (Lepidochelys kempii) come ashore to nest and lay their eggs on the beach. This mass nesting event is known as an arribada, meaning “arrival by sea” in Spanish. Scientists didn't know where kemp's ridleys nested until the late 1940's, when a filmmaker filmed more than 40,000 turtles coming ashore to nest on the same night in Rancho Nuevo, Mexico. Today, however, far fewer Kemp's ridleys come ashore to nest; in 2011, when this photo was taken, just 20,000 nests were found in Mexico, and 81 percent of those were at Rancho Nuevo. Read more at the Ocean Portal blog.

PreviewHawksbill turtles (Eretmochelys imbricata) are small to medium-sized turtles, but can get as large as 200 lbs (91 kg). Adults live among healthy coral reef communities, feeding primarily on sponges, but they also eat other invertebrates like sea cucumbers,

Hawksbill Turtle

Credit: Flickr user BarryFackler

Hawksbill turtles (Eretmochelys imbricata) are small to medium-sized turtles, but can get as large as 200 lbs (91 kg). Adults live among healthy coral reef communities, feeding primarily on sponges, but they also eat other invertebrates like sea cucumbers, tunicates (sea squirts), crabs, sea stars, and mollusks, as well as some algae.

PreviewLeatherback turtles (Dermochelys coriacea) are the largest sea turtles, growing as long as six and a half feet (2 m) and weighing some 2,000 pounds (900 kg). They’re unlike the other marine turtles in two important ways: they have a thick leathery carapa

Leatherback Turtle

Credit: Claudia Lombard, USFWS

Leatherback turtles (Dermochelys coriacea) are the largest sea turtles, growing as long as six and a half feet (2 m) and weighing some 2,000 pounds (900 kg). They’re unlike the other marine turtles in two important ways: they have a thick leathery carapace (outer covering) instead of a hard bony shell, and can survive in colder waters, allowing them to feed closer to the North and South poles where other turtles can’t survive. Their jaws are too weak to eat hard-bodied prey, so they mostly eat jellyfish and salps.

PreviewLoggerhead turtles (Caretta caretta) are named for their large heads and strong jaws, which allow them to eat prey with hard shells, like big marine snails. They live throughout the world’s warm tropical and subtropical oceans. They live off-shore when t

Loggerhead Turtle

Credit: USFWS

Loggerhead turtles (Caretta caretta) are named for their large heads and strong jaws, which allow them to eat prey with hard shells, like big marine snails. They live throughout the world’s warm tropical and subtropical oceans. They live off-shore when they’re young, and migrate closer to the coastline as they mature.

 

PreviewOlive ridley turtles (Lepidochelys olivacea) are the smallest marine turtle, living in warm waters close to shore as adults. Female olive ridleys take part in mass nestings that can involve 150,000 individual turtles crawling up a beach at night to find a

Olive Ridley Turtle

Credit: Flickr user Nodnarb Truk

Olive ridley turtles (Lepidochelys olivacea) are the smallest marine turtle, living in warm waters close to shore as adults. Female olive ridleys take part in mass nestings that can involve 150,000 individual turtles crawling up a beach at night to find a spot for their clutch of around 100 eggs.

PreviewUnlike the other six species of marine turtle, the Australian flatback (Natator depressus) has a very limited distribution, found only from northern Australia to Papua New Guinea/Indonesia and it only breeds in Australia. Flatback turtles tend to spend mos

Flatback Sea Turtle

Credit: Reef Catchments

Unlike the other six species of marine turtle, the Australian flatback (Natator depressus) has a very limited distribution, found only from northern Australia to Papua New Guinea/Indonesia and it only breeds in Australia. Flatback turtles tend to spend most of their time at the ocean's surface, often with a bird making use of their shell as a small landing space perfect for a break.