1. Loggerhead sea turtle _(Caretta caretta)_: Loggerheads are the most common sea turtles in the Gulf of Mexico. They are found throughout the Gulf but are most abundant in the northern Gulf. Loggerheads are large turtles, with adults reaching lengths of up to 3 feet and weighing up to 350 pounds. They have a brown or olive-colored shell with a yellow or orange head and flippers.
2. Kemp's ridley sea turtle _(Lepidochelys kempii)_: Kemp's ridleys are the most endangered sea turtles in the world. They are found primarily in the western Gulf of Mexico, particularly in the waters off the coast of Texas. Kemp's ridleys are small turtles, with adults reaching lengths of up to 2 feet and weighing up to 100 pounds. They have a gray or olive-colored shell with a yellow or orange head and flippers.
3. Green sea turtle _(Chelonia mydas)_: Green sea turtles are found throughout the Gulf of Mexico but are most abundant in the southern Gulf. They are large turtles, with adults reaching lengths of up to 5 feet and weighing up to 350 pounds. Green sea turtles have a green or olive-colored shell with a black or brown head and flippers.
4. Hawksbill sea turtle _(Eretmochelys imbricata)_: Hawksbill sea turtles are found throughout the Gulf of Mexico but are most abundant in the southern Gulf. They are small turtles, with adults reaching lengths of up to 3 feet and weighing up to 150 pounds. Hawksbill sea turtles have a brown or olive-colored shell with a yellow or orange head and flippers.
5. Leatherback sea turtle _(Dermochelys coriacea)_: Leatherback sea turtles are found throughout the Gulf of Mexico but are most abundant in the northern Gulf. They are the largest sea turtles in the world, with adults reaching lengths of up to 6 feet and weighing up to 2,000 pounds. Leatherback sea turtles have a black or brown leathery shell with a white or yellow underside.