Rinse shrimp under cold water and pat dry.

In a skillet over medium heat, add olive oil. Once hot, sauté shrimp with salt and pepper until pink and opaque (about 3 minutes per side).

While shrimp cooks, dice mangoes and avocados; finely chop onion.

In a bowl, whisk together lime juice, olive oil, salt, and pepper.

In a large bowl, combine cooked shrimp with mangoes, avocados, red onion, and cilantro. Drizzle with dressing and gently mix.

Serve immediately or chill for later enjoyment.