Never trust a species that grins all the time. It's up to something.
Dolphins are truly majestic creatures. They appear a bit human-like and even save humans in danger. No wonder that the ancients speculated that dolphins are descendants of the Atlanteans. What's more, they're friendly, cute, and are probably about as close to an alien intelligence as you're likely to meet in this life.
Given their appealing nature, dolphins frequently feature in fiction in a number of ways. Listed below are common tropes associated with dolphins. Please list examples on the appropriate trope page, not on this page.