What are the characteristics of manatees?

Manatees are mammals, with a body length of1.5-4m and a weight of 300-400kg. Some of them are large, spindle-shaped, with small heads and thick skulls. People all have the same face, nose and eyes, small eyes and small ear holes in the back. There are teeth in the mouth, male front teeth protrude out of the mouth, and molars are like cylinders without enamel. Hair is short and thin, forelimbs are like fins, no nails, and tail fins are round. They usually live on seaweed and fish and shrimp. Give birth to a child every year. When breastfeeding, the mother manatee holds her baby on her chest with a pair of side fins, and her upper body floats on the sea, half lying down to nurse, which is quite similar to the legendary mermaid. When a child is breastfeeding, his nose should be exposed to avoid suffocation. Manatees' teeth have strong regenerative ability. The front buccal teeth have fallen off and are supplemented by the back buccal teeth. An adult manatee can eat 50 kilograms of marine plants every day, so it is nicknamed "marine scavenger". Guyana in South America used two manatees to clear the aquatic plants in the waterway near the capital Georgetown, so that residents got enough domestic water.

Legend has it that "Mermaid" can sing, which was widely circulated in the West as early as ancient Greece. In fact, manatees can't sing. This mystery was uncovered not long ago. It was discovered by American marine zoologists Pine and El after long-term underwater observation. The emblem of Warsaw, the capital of Poland, is a "mermaid" with a sword and shield. It has become the "patron saint" of Warsaw. Manatee is a rare marine animal and a first-class protected animal in China. China has designated Shatian sea area in Hepu, Guangxi as a protected area.