P. hydrobothynus lives in large social groups of three to twelve members. A group of otters is called a pride when they are on land, and a raft when they are in the water. There are never more than two males per pride of stellar river otters, and these males are always related. A male may have a number of females ranging from one to six. In a pride of otters, there is a dominant male who rules over the entire pride. If the second male is lucky he may have the opportunity to have a female of his own however this usually is not the case. Female stellar river otters may have one to three pups a year. The male will only have one pregnant female at a time and the entire group works together to raise the pups. This prevents overcrowding in the burrows and it gives the pups more attention and resources due to a group effort to raise them. Pups stay with the pride until they are two years old. Young males are kicked out of the pride by their father, and young females will either leave on their own or be taken by another prides male.
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