Sea Turtles

10 Curious Facts About Sea Turtles

Sea turtles are long-lived marine reptiles, some can live up to 50 years or more. Although they will not reach sexual maturity until they are around 30 years old. They have survived for more than 100 million years, but in the past decades have faced human threats that could lead to their eventual extinction.

Some of these threats, like exploitation for their meat or shells and egg poaching, pollution, habitat loss due to coastal development and climate change have had a huge impact on sea turtle numbers. Accidental capture by fishing gear (which often results in death) remains one of the greatest threats to most sea turtles. Vessel strikes are also very common and can injure or kill turtles. Injuries or death may be caused by propellers and blunt force trauma from the vessel’s hull!

Sea turtles spend the bulk of their lives in the ocean, only periodically going ashore to either bask or nest. They do frequent coastal habitats such as tidal mangrove creeks, seagrass beds and coral reefs, which are important foraging areas for them. By feeding on them, sea turtles help maintain seagrass beds and coral reefs. This means that they are not just charismatic and cute animals, but a vital species for healthy marine ecosystems.

turtles hatching
Turtles hatching and making their way to the sea

Ocean Mimic chose sea turtles to be one of the mimic suits because they are such a joy to see underwater and are a vital marine species. This is what Emma had to say:

“Who doesn’t love turtles? While they are so strange to look at and totally different to anything else they still have that cute factor and peaceful charm. No wonder they have the whole world in love with them!”

turtle swimwear
Laura in the stunning turtle mimic suit!

 

Curious facts about sea turtles:

  1. Sea turtles cannot retract into their shell, unlike other turtles.
  2. They can hold their breath for five hours underwater and sleep underwater.
  3. Leatherbacks can dive more than 1000m/3000ft deep.
  4. The sex of sea turtles, like other reptiles, depends on the temperature in the nest. This is a problem because of raising temperatures with climate change, most turtles are now female, which means less males to reproduce with.
  5. Turtle eggs hatch at night, to avoid most predators. They also hatch all at the same time so that most of them will reach the sea before they get eaten, it’s called “safety in numbers”. Newborns have a little beak on top of their mouth to help them break the egg shell.
  6. On their way from the nest to the sea, newborn turtles will learn the characteristics of their home beach, which is called impronta. Many years later, as grown up females, they will return to the exact same beach to lay their eggs (this is called natal homing).
  7. They can detect the Earth’s magnetic field and they use it as a compass.
  8. Little is known about their early lives, but tracking baby turtles with manicure supplies are helping change this – more info here
  9. They often migrate thousands of kilometers between pelagic feeding areas and coastal breeding grounds.
  10. One in two sea turtles have ingested plastic. Often mistaking it for food like jellyfish!

 

Scientists recognise 7 living species:

Loggerhead:

Loggerhead sea turtle sleeping
Scientific name = Caretta caretta. Photo credit @oceanprophotography

Named for its exceptionally large head. The largest of the hard shell species, they can weigh more that 1000 pounds!

Green:

Green sea turtle swimming
Scientific name = Chelonia mydas. Photo credit: @benjhicks

Named for the green colour of their body fat. It’s the only turtle that is strictly herbivorous as an adult. Their jaws are finely serrated which aids them in tearing vegetation.

Leatherback:

Leatherback sea turtle swimming with remora
Scientific name = Dermochelys coriacea. Photo credit: @alexkyddphoto

The Leatherback is the champion of sea turtles. They grow the largest, dive the deepest, and travel the farthest. They are also the only species not to have a hard shell.

Hawksbill:

Hawksbill Sea Turtle
Scientific name = Eretmochelys imbricata. Photo credit @dohertyphotography

Named for its hooked, hawklike beak. They have the most gorgeous shell (amber-colored and beautifully patterned), which means that they are often hunted for it. This is one of the reasons why they are extremely at risk of extinction nowadays.

Kemp’s ridley:

Kemp's Ridley sea turtle on the beach
Scientific name = Lepidochelys kempii. Photo credit: @surfsidebeachtc

Named Kemp’s after Richard Kemp, who helped discover and study this species. They are the smallest and most endangered.

Olive ridley:

Olive Ridley sea turtle in the surf
Scientific name = Lepidochelys olivacea. Photo credit: @turtleislandrestorationnetwork

They nest every year in mass synchronized nestings called arribadas (Spanish for “arrival”). During an arribada thousands of turtles come ashore at the same time to lay eggs on the same beach. In some countries, like Costa Rica, it is unfortunately legal to harvest eggs for human consumption during these arribadas!

Australian flatback:

Australian flatback near the surface
Scientific name =Natator depressus. Photo Credit: @qldtrustfornature 

Named because its shell is very flat. This is the least studied species of turtles, but has the most limited range.

 

Five of the seven species are found around the world (mainly in tropical and subtropical waters) and are highly migratory. The remaining two species having restricted ranges. Kemp’s ridley is found mainly in the Gulf of Mexico and the flatback turtle around northern Australia and Southern Papua New Guinea.

Because of this widespread distribution, in order to truly protect sea turtles around the world it is necessary that all the countries work together to enforce international laws that ensure their protection.
Sea turtle researchers and conservationists are already collaborating as a global network to achieve sustainable and long-term goals to saving turtles. Every year they publish a new volume of The State of the World’s Sea Turtles (SWOT) Report. The latest report can be found here

Let us know which is your favourite turtle!

 

Loreto Vila (@lorecroft_scuba) is a marine biologist and divemaster who studied sea turtles in the Caribbean. Her first experience was with nesting females and newborn turtles in a conservation area in Costa Rica. She also worked with juvenile turtles in the shallow areas of the Bahamas, studying feeding behaviour. She loves talking about turtles and sharing less-known facts about them!

Sources:

Sea Turtle Status

Sea Turtle Conservancy

Eco Watch

WWF

Mental floss

National Geographic

Smithsonian Ocean

 

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