Jaegermonsters are a group of modified humans that can readily compared to bricks - they're a bit dull, rough around the edges, are hard to break, and are great for throwing through windows. There's never just one of them, either, though they aren't particularly good for building with. They're a bit too rowdy for that, loving a good fight more than anything else and any threats of bodily harm violence only encourages them. Their entire attitude towards death and suffering is incredibly cavalier, due to their longevity and regeneration abilities. As you can imagine, this means they don't need to band together to win a fight, so the primary reason they're usually found in large numbers is a social one. They're pack minded, and leaving the pack, or being disowned is considered akin to death.