The finless porpoise is a mammal of the order Rodentia and family Hylidae. Large body size. Wide head, short and round ears, small eyes; The kiss is thick and short, with a truncated front end and a large upper lip; The limbs are short and thick, with four toes on the forefoot and three toes on the hind foot, with slight webbed spaces between the toes; The body hair is thick and sparse, with a dark grayish yellow color. Distributed in South America, living in the Amazon River basin. They inhabit riverbanks or swampy areas, often in family clusters. Gentle in personality, quiet in nature, slow in movement, able to quickly jump into the water and escape when faced with danger. Proficient in swimming and diving, able to swim long distances underwater or hide in aquatic plants for extended periods of time without moving. Feed on reeds and other plants in the river.