However,not all sea creatures are vevomous. Dolphins not fish but, like whales, are warm-blooded mammals. They communicate with each other using different sounds. They are very intelligent and can learn many trick in captivity. The same cannot be said of sea turtles. They seem creatures of instinctwhen it is time for the female to lay her eggs, she swim to the shore, digs hole,lay the eggs and covers them with sand