Mollusca – snails, it is one of my favorite animals.

Most snails move by gliding along on their muscular foot, which is lubricated with mucus.

As the snail grows, so does its calcium carbonate shell. Thus, snails need a lot of calcium to produce a strong and healthy shell. Baby snails will eat their shells to get more calcium then produce a stronger shell later.

In addition, when the animal reaches full adult size, many species of snails build a thickened lip around the opening of the shell. At this point the animal stops growing, and begins reproducing.

Also, land snails have a reproductive opening on one side of the body, near the front, through which the outer reproductive organs are extruded so that exchange of sperm can take place. After this, fertilization occurs and the eggs develop. Anyway, snails need to stick together for 24hrs just to transfer the sperm from male to female. How slow is this man? But they are still adorable…

They said snails are brought by winds and birds. I will check it out after exam! =)