Sea-turtle, which is also known as marine turtle, is classified under families of Cheloniidae and Dermochelyidae. Currently, there are seven species of sea-turtle known worldwide:
![Loggerhead (Caretta caretta) Weight: 157 to 375 lbs Diet: whelks and conchs](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Loggerhead.jpg) Loggerhead (Caretta caretta) Weight: 157 to 375 lbs Diet: whelks and conchs |
![Green turtle (Chelonia mydas) Weight: 300 to 350 lbs Diet: seagrass and algae](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Green.jpg) Green turtle (Chelonia mydas) Weight: 300 to 350 lbs Diet: seagrass and algae |
![Leatherback (Dermochelys coracea) Weight: up to 2000 lbs Diet: soft-bodied animals, e.g. jellyfish and salps](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Leatherback.jpg) Leatherback (Dermochelys coracea) Weight: up to 2000 lbs Diet: soft-bodied animals, e.g. jellyfish and salps |
![Hawksbill (Eretmochelys imbricata) Weight: 100 to 150 lbs Diet: sponges and other inverterbrates](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Hawksbill.jpg) Hawksbill (Eretmochelys imbricata) Weight: 100 to 150 lbs Diet: sponges and other inverterbrates |
![Kemp's Ridley (Lepidochelys kempii) Weight: 100 lbs Diet: crabs, fishes, jellyfish, mollusks](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Kemps_ridley.jpg) Kemp’s Ridley (Lepidochelys kempii) Weight: 100 lbs Diet: crabs, fishes, jellyfish, mollusks |
![Olive Ridley (Lepidochelys olivacea) Weight: 100 lbs Diet: algae, lobster, crabs, mollusks, shrimps](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Olive_Ridley.jpg) Olive Ridley (Lepidochelys olivacea) Weight: 100 lbs Diet: algae, lobster, crabs, mollusks, shrimps |
![Flatback (Natator depressa) Weight: 198 lbs Diet: sea cucumber, jellyfish, shrimps, mollusks](https://blogs.ntu.edu.sg/hp331-2014-20/files/2014/10/Flatback.jpg) Flatback (Natator depressa) Weight: 198 lbs Diet: sea cucumber, jellyfish, shrimps, mollusks |