The Loggerhead sea turtle, Caretta caretta, can be found worldwide in all tropical and subtropical oceans. It is the most common species of sea turtles, which doesn't change the fact that it is an endangered species. Single specimens can reach a carapace length of up to 2 meters and weigh up to 200 kg.
The animals feed on crustaceans, cephalopods, echinoderms, vegetable matter and paricularly jellyfish, as can be seen in the images in this article. The main picture shows for example an adult Caretta caretta eating a jellyfish of the species Mastigias roseus and the second image shows a freshly hatched sea turtle hunting a jellyfish (presumably from the family Ulmaridae). Both pictures have been provided by Heinz Mahler.
It is common knowledge nowadays that sea turtles burry their eggs on land and that freshly hatched turtles crawl back into the sea, we just mention it here for the sake of completeness.