The benefit of observational learning is when you learn by the experience of others. It can help kids improve on behavior(EXAMPLE) If a child sees and adult being kind and compassionate, they may learn from that trait. It also helps memory. They retain the information and mimic what they see.
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Cats can purr for various reasons, using the soft rumble as a way of communicating and as a form of self-soothing or even healing. This is why cats will often purr when they're injured, or after a stressful event.