THE LOGGERHEAD SEA TURTLE- This turtle is the largest of all sea turtle species. The loggerhead turtle experienced a 40 percent decline in nesting population the last 10 years. They are listed under the Endangered Species Act. Depending on the species, sea turtles may be carnivorous (meat eating), herbivorous (plant eating), or omnivorous (eating both meat and plants). The jaw structure of many species is adapted for their diet.Loggerheads' jaws are adapted for crushing and grinding. Their diet consists primarily of crabs, mollusks, shrimps, jellyfish, and vegetation.