You can write a composition in the rich ocean of math diary. Before, my parents took me to the seaside to play. There are many grains of sand and big stones, and many unknown little creatures are crawling around on them. There are some small animals under the stone. Mud snails swim in small puddles, while crab snails and small crabs crawl in cracks. There are not only small crabs and small fish, but also flower snails, fragrant snails and sand pears. At this time, I found a small fish that can jump around on the stone. They are called "mudskippers". Why can they jump on rocks? It turns out that they have no gills and breathe with their lungs. The sea is really a beautiful and rich place.