This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
A lion pride can hold up to three resident males, a dozen or more related females, and their young, all of it, per National Geographic Education, built around the females: the lionesses and their cubs are typically all related to one another, which makes the pride fundamentally a maternal line that males join rather than a group either sex owns outright. That structure has a built-in expiration date for every young male born into it. At around two to three years old, males leave the pride, driven out because they are old enough to start competing with the dominant males who currently hold the position, and from that point on a young male has to find a new pride to take over and hunt for himself in the meantime, alone, without the cooperative hunting structure he grew up inside. It is a hard transition by design rather than by accident: a pride that let its own sons stay and mature into rivals would eventually fracture from the inside, so the same relatedness that makes a pride stable also makes it, at a certain age, actively unlivable for its own male members. The departure is not punishment. It is closer to a scheduled event built into how the social structure holds together at all.