1. Tortoise: It belongs to the genus Tortoise, Tortoise and Tortoise. Widely distributed in Atlantic Ocean, Pacific Ocean and Indian Ocean. Trionyx sinensis is distributed in Shandong in the north and Beibu Gulf in the south. The length can reach more than 1 m, and the maximum life span is about 150 years old. There is a pair of forehead scales on the top of the head.
2. Starfish: It is the most representative echinoderm in structure and physiology. The body is flat, mostly symmetrical with five spokes, and the boundary between the body disk and the wrist is not obvious. Live with your mouth down and your mouth up. There is a stepped groove on the ventral side of the stomach, and the tube foot extends out of the groove. The bone plate of endoskeleton is connected by connective tissue and flexible and elastic.
3. Dolphin: It has the typical morphological characteristics of toothed whales: spindle-shaped body; A crescent-shaped breathing hole; Cranial intussusception, maxillary retroexpansion, frontal bone overlap; Left cranial top asymmetry; Tapered or spiked teeth, etc. The most obvious differences between species are related to feeding organs, such as beak, upper and lower jaws and teeth.
4. Walrus: an animal belonging to the genus Walrus of Walrus. As the name implies, it is an elephant in the sea. It has a huge body, wrinkled skin, sparse bristles, small eyes and poor eyesight. With two long teeth.
5. Hippocampus: It is the general name of several small warm marine fishes of the family Syngnathidae, and it is a small marine animal with a body length of 5-30 cm. Named after the head bends at right angles to the body, the head is horsehead-shaped, at an angle to the body shape, with a long tubular snout, a small mouth and dorsal fins, all of which are composed of fins. The eyes can move independently.
6. Squid: Also known as soft fish and squid, it is an eye-opening suborder of Cephalopoda of Mollusca. The body is conical, pale, with hazel spots and a big head. There is a 10 foot in front, and the fleshy fin at the end is triangular, often swimming in groups in the ocean about 20 meters deep.
7. Blue whale: It is a marine mammal, belonging to the suborder baleen whales. * * * There are four subspecies. The blue whale is considered to be the largest known animal on earth, with a body length of 33 meters and a weight of 18 1 ton. The blue whale has a slender body and a blue-gray back, but sometimes it looks lighter in water.