THE ANIMAL FILES

Hawksbill sea turtle

Eretmochelys imbricata

A narrow hooked beak reaches food among reef structures.

The hawksbill sea turtle combines a tapered beak with overlapping shell scutes. Adults often use coral-reef habitats, where sponges form an important part of the diet. Their food choices are selective rather than a simple sweep through every sponge on the reef.[1]

Follow the evidence ↓
Hawksbill sea turtle
Image: Diego Delso · Commons · CC BY-SA 4.0
Mouth
A pronounced hooked beak[1]
Shell
Overlapping scutes create a serrated rear edge[1]
Important food
Selected kinds of sponges[1]

The shell is built from overlapping scutes

The back shell carries thick scutes whose rear overlap produces a jagged outline. The head is tapered and ends in a hooked mouth. These features explain the species’ familiar appearance without relying on body size, which varies across individuals and stages.[1]

Reef space includes places to rest

Adult hawksbills often rest in reef caves and beneath ledges. They also use other marine environments, including lagoons and some estuarine habitats. The reef is therefore a feeding and shelter structure, with crevices and overhangs adding physical opportunities beyond the open water around it.[1]

A sponge-eater still chooses

Sponges are a principal food, but hawksbills favour some kinds and ignore many others. Other marine organisms are also recorded in the diet. Feeding studies need to distinguish a broad category such as sponge from the particular species selected within that category.[1]

A COMMON MIX-UP

Does eating sponges mean eating every available sponge?

No. Hawksbills show selection among sponge types. The presence of an abundant food category does not establish that all members of it are equally used.[1]

TRY A LITTLE REASONING

Why compare stomach contents with the surrounding reef?

Reveal the explanation

The reef shows what was available, while the stomach shows what was taken. Comparing the two helps separate preference from a pattern caused simply by which food happened to be common.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Hawksbill sea turtle (fixed revision; adapted and translated)
  2. NCBI Taxonomy — Eretmochelys imbricata (identity and classification)

Last fact check:

One discovery leads to another

Loggerhead sea turtleStrong jaws meet a life that begins among floating weeds.Caretta caretta ↗Green sea turtleThe green in the name is not a promise about the shell.Chelonia mydas ↗Olive ridley sea turtleA nesting crowd begins in the sea.Lepidochelys olivacea ↗