The finless porpoise is lively and active, often running up and down in the water, and its body keeps rolling, jumping, nodding, spraying water or suddenly turning. Whenever there are big boats in the river, finless porpoises like to follow the top waves or ride the waves.
The finless porpoise also has an interesting spitting behavior. It sticks its head out of the water and swims forward quickly, opening and closing its mouth and spraying water from time to time. When breathing, only the head is exposed, the tail fin is hidden under the water, and then dives into the water like a bounce.