Scientists pointed out that judging from the current scientific achievements, it is very unlikely that there are mermaids in the ocean. As for all kinds of sightings, it may be that humans regard mammals in the water as mermaids, and the most representative ones are manatees and dugongs. Because these two creatures are very similar to humans when feeding, they are likely to be misjudged.

Experts say that people have evidence, because it is essential to have a respiratory system that adapts to the survival in the sea if you want to survive in the water for a long time. The most prominent performance of this respiratory system in the body is gills. As a large mammal, whales have evolved a respiratory system that can survive in the sea for tens of millions of years, so they have to leak out of the water to breathe fresh air from time to time.