Skip this step if your shrimp is peeled and deveined. Peel and devein the shrimp by separating the shell from the underside of the shrimp and removing it. Using kitchen shears, cut along the top middle of the shrimp from the head to tail to expose the membrane and remove it.

Chop the shrimp into 1/2" chunks and place in a medium bowl. Add the salt and pepper and toss gently to combine, then add the lime, lemon and orange juice and stir gently, making sure that the shrimp is submerged in the citrus juice. Cover the bowl with plastic wrap and refrigerate for 30 minutes and up to 2 hours, stirring occasionally. When the shrimp is "cooked", it will be opaque (white or pink depending on its original color).

Do not drain the liquid from the shrimp! Add the mango, avocado, bell pepper, red onion and cilantro and toss to combine. Adjust the seasoning as needed, then serve and enjoy!