noun
habit; acquired tendency
Refers to a habitual pattern of behavior, especially one acquired through repetition or conditioning. Often used for animals and people.
猫は夜行性の習性がある。
Cats have a nocturnal habit.
彼は毎朝ジョギングする習性がついた。
He developed the habit of jogging every morning.
noun
Describes characteristic behavior or an inherent trait, often of animals or people. Broader than a simple habit; can refer to innate or typical patterns.
渡り鳥の習性はまだ完全には解明されていない。
The behavior of migratory birds is not yet fully understood.
彼のそういう習性は直らないだろう。
That trait of his probably won't change.