Don't believe anyone who says dolphins are intelligent. That's all bullshit from weirdos who dropped acid and say they "talked" to dolphin while they were jerking them off.
Brain size doesn't matter. Crows are far smarter than animals with brains larger than their entire body
Dolphins really aren't intelligent. The majority of their brain mass is meant for dealing with the cooler temperatures in the ocean. They're bottom tier when it comes to neuron density. They're stupid behaviorally too.
Everything about dolphins being intelligent is based on bullshit from the quack John Lilly