Material preparation: paper, pens and colored pens.

Step 1: Draw a long arc first, and draw a short arc below.

Step 2: Long arc is followed by bending arc, and short arc is followed by bending short arc.

Step 3: Draw a crescent-shaped semicircle at the end and connect them.

Step 4: Draw the shark's dorsal fin on it, which is the symbol of the shark.

Step 5: After the shape is drawn, draw the shark's big mouth inside.

Step 6: Use the small dotted line to represent the teeth inside, and use the two dots above as eyes.

Step 7: Draw its fins on the side of the shark, and draw several small arcs next to the mouth to make the structure of the shark.

Step 8: Draw some wavy lines around the shark as water ripples.

Step 9: Finally, paint the painted shark with beautiful colors.

In this way, a horrible shark stick figure was drawn.

Introduction to sharks:

I. Biological classification

Shark is one of the oldest fishes, which belongs to the cartilaginous fishes in the animal kingdom, Chordata, Vertebrata, Chondrichthyta and Cladocera (Sharsuborder) in biological classification. There are about 250 ~ 300 kinds of sharks in the world. The common sharks are man-eating sharks, dog sharks, hammerhead sharks, mako sharks and whale sharks.

Second, living habits.

Sharks are widely distributed in the oceans of the world, especially in tropical, subtropical and temperate waters. They are carnivores, fierce and greedy. They mainly feed on bony fish such as mackerel and herring, but also prey on crustaceans, cephalopods, turtles, seabirds and marine mammals, and often attack humans.

Third, the mode of reproduction

1. Egg-laying type: The egg shell of an egg-laying shark is peculiar, and its size and shape vary from species to species. Most of them are rectangular with slender tendrils at four corners, which are used to entangle algae, stones and other objects for hatching.

2, viviparous: most sharks are viviparous fish, fertilized eggs develop into fetuses in the mother's uterus, and finally give birth to larvae, the number of fetuses ranges from dozens to only 2 ~ 3.

3. Viviparous type: A few sharks are viviparous fish. The maternal uterine wall of viviparous shark and fetal yolk sac form yolk sac placenta, and maternal nutrients and oxygen enter the fetus through yolk sac placenta.