Sailors used to believe that the call of the sealguana was that of a mermaid. However, upon finding the source of these sounds, sailors were disappointed to realize that they were only animals, not mermaids, and killed them for food.
The sealguana has the torso of an iguana and the flippers of a seal. It is usually green or blue in color, with a darker line of thorn-like spikes that run along its spine, from the top of the skull down to the tip of the tail.
The sealguana legends strongly resemble the legend of sirens in ancient Greek mythology. Essentially, sirens would lure sailors using their beautiful, harmonious calls. Once the sailors arrived, however, the sirens would kill them. This is similar to how sealguanas would accidentally lure sailors with their beautiful calls. However, in this case, the sailors kill the sealguanas instead.