Amphibian Man

The Amphibian Man is a sapient humanoid amphibian captured in the Amazon basin and brought to a secret government facility in Baltimore, USA, in 1962. The creature is worshiped as a deity by at least one native culture in the Amazon.

Biology
As his name indicates, the Amphibian Man is a human-sized, tail-less biped and possesses typical amphibian traits such as gills and webbed hands. He spends most of his time underwater, but is also capable of surviving on land for a limited period.

He has been described as capable of alternating between two separate breathing mechanisms, which Colonel Strickland compares to mudskippers (which use both gills and cutaneous breathing). In the Amphibian Man's case, however, he actually possesses primary and secondary lungs, which are separated by thick jointed cartilage. Still, his gills clearly constitute his primary means of breathing, and he can't stand long without water.

The Amphibian Man is fully sapient, but doesn't seem to communicate vocally. Although Strickland claims to have found him in a river, he appears to have a physiological need for saltwater. His skin can generate blue bioluminescence. His genital organ is retractable.

As for feeding habits, it's likely that his species is carnivorous, as he has been observed feeding on a cat and enjoys boiled eggs. However, he may also eat flowers and fruits, which the natives toss into the river as offerings to him. Like most vertebrates, he has red blood.

Perhaps most notably, the Amphibian Man also has a fantastic ability to trigger tissue regeneration by touch. The effect is usually not immediate, but his touch can cause wounds to be healed and a bald man's hair to regrow overnight.

Appearances

 * The Shape of Water (2017)