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This Lions behaviors indicates that they are very territorial, they protect their pack and their cubs and others.

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It's like humans having their own territorial no one goes inside their home, Just like for lions no one steps a foot in the territory or they will kill them.

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Social Behavior | College of Biological Sciences (link)

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It became an adaptation because majority male lions are bosses and like a king so they wanna protect and especially show off to female lions for mating, And when they become a protector they earn respect from there pack. It's their home, their family and pack and they'd kill for it to protect them.