There are 7 known species of sea turtle today including the flatback sea turtle which is native to Australia; the green sea turtle which is found all over the world but there are larger populations of the green sea turtle in the Atlantic and Pacific oceans; the hawksbill turtle is a critically endangered species of sea turtle and can be found all over the world; the kemps ridley turtle is the rarest species of sea turtle in the world and is found in the Atlantic ocean and in the Gulf of Mexico; the leatherback sea turtle is the largest species of sea turtle and is the most widely distributed species of sea turtle, found all over the world; the loggerhead sea turtle is known for it's large head and is mainly found in the Atlantic, Indian and Pacific oceans; the olive ridley sea turtle is the smallest species of sea turtle and is generally found in the Indo-Pacific and Atlantic oceans.