In_the_vast_ocean_live_many_creatures① with_great_
intellectual_and_physical_capacities②.Dolphin is one of those great creatures，whose capacities to think and move at an amazing rate puzzle those who study their behaviors.Dolphins' brain，which is almost the_same_size_as③ that found in the human head，makes them different from all the other sea creatures.Dolphins' babies are born in the water.They can grow up to three and a half mete rs long.Dolphins use_sound_to_help_them④ find their way，look for their food and talk with each other.Sound is just_like⑤ their eyes and mouths.
