Dolphins were once believed to be the most intelligent species on TinyTIM or on Earth-Prime. Due to recent discoveries in the field of zoological intelligence testing, this has been disproven--however, dolphins are still far more intelligent than their nearest competitors, human beings, _homo sapiens sapiens_. Of course, a dolphin's mental capabilities get the living MOE beaten out of them when compared to dragons, white mice, or cats.
See also: Human Beings, Dragons, White Mice, and Cats.