Hawksbill Sea Turtle

Kingdom
Phylum
Subphylum
Class
Order
Suborder
Family
Genus
SPECIES
Eretmochelys imbricata
Population size
23,000
Life Span
30-50 yrs
TOP SPEED
24 km/h
WEIGHT
46-70 kg
LENGTH
71-89 cm

The hawksbill is a small sea turtle. The young have a heart-shaped shell. As they grow, their shells become longer. All of these turtles, except very old ones, have serrations on the lateral and hind areas of their shells. Their heads are V-shaped, which gives them the look of birds’ beaks. There are 5 features that distinguish hawksbill sea turtles from other sea turtles. There are two sets of prefrontal scales on their heads, they have two claws on their forelimbs, their shells have thick, overlapping plates on the back, and four pairs underneath, and the shape of their mouths is different. Males have brighter pigmentation, a concave chest area, a thicker tail and long claws.

Distibution

Hawksbill sea turtles live mainly in the tropical reefs of the Pacific, Indian and Atlantic Oceans. They most commonly inhabit hard-bottomed and reef areas containing sponges, and also live in shoals, continental shelves and the lagoons of oceanic islands. In general, they inhabit water not more than sixty feet (18.3 m) deep.

Hawksbill Sea Turtle habitat map

Climate zones

Habits and Lifestyle

Typically diurnal (except during the mating season), solitary hawksbills comb the continental shelves and reefs searching for food. They spend most of their life in the water foraging, resting and cleaning, and come ashore only for laying eggs. They mainly stay close by shorelines, where coral reefs with sponges are found, and not far from tropical beaches that are their nesting sites. Like other sea turtles, the hawksbill sea turtle makes incredible migrations when moving from feeding sites to areas where they nest.

Diet and Nutrition

Hawksbill sea turtles feed mainly on sponges. Sea invertebrates, such as sea jellies are also common prey. They are omnivorous, eating mollusks, fish, crustaceans, marine algae, and other sea animals and plants. They like to feed in shallow shoals which have lots of brown algae.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
July-October
PREGNANCY DURATION
About 2 mont
BABY CARRYING
100-140 eggs
INDEPENDENT AGE
At birth
BABY NAME
Hatchling

Hawksbill turtles are generally monogamous and during the season they don't tend to re-mate. The female makes the decision who to mate with. It is believed that turtles will mate with the same turtle each season, but this has not been proved. Nesting usually takes place between July and October. At the time to lay eggs, the female makes her way to the site on the beach. This process usually happens 3 times during each mating season, within 15 days of each other. The eggs are placed in clutches of 100 to 140 at a time, then the female covers the eggs up. The hatchlings emerge in about 2 months, after taking several days to dig themselves out. They then head to the water. Hawksbills are able to mate from the age of 3 to 10 years old.

Population

Population threats

A major threat to this animal is the illegal trade in much sought-after tortoiseshell, which has been used for centuries for jewelry and ornaments. There is also a large market for their meat and eggs, as well as stuffed young turtles as exotic gifts. They are also threatened by harvests for traditional customs, accidental tangling in fishing lines, the loss of nesting sites, and the degradation of coral reef systems, which are their feeding grounds. Climate change is a further threat. Ocean levels have risen and are predicted to rise even more in the future. This can lead to increased erosion of beaches and further degradation, which could wash nests away and decrease the nesting habitat.

Population number

According to the Sea Turtle Conservancy resource the total population size of nesting Hawksbill sea turtles is around 20,000-23,000 individuals. Overall, currently this species is classified as Critically Endangered (CR) on the IUCN Red List and its numbers today are deceasing.

Ecological niche

Hawksbills help with maintaining the health of the coral reefs by removing prey such as sponges off the reef's surface, thus enabling better feeding access for reef fish.

References

1. Hawksbill Sea Turtle Wikipedia article - https://en.wikipedia.org/wiki/Hawksbill_sea_turtle
2. Hawksbill Sea Turtle on The IUCN Red List site - http://www.iucnredlist.org/details/8005/0

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