There are a handful of reports on the Internet of people who have encountered beings which they call 'Hammerhead aliens,' because the head of the beings is reminiscent of hammerhead sharks.
The beings are the size of a human being, and according to some testimonies look like a cross between human and hammerhead shark. More specifically, their head looks like the head of a hammerhead shark, though some reports merely state that their eyes are on extensions, as is the case with hammerheads.
Their skin is said to be either brown or bluish grey. The brown ones are said to be mean looking.
They have mainly been encountered during abduction events, though there are some reports of plain encounters as well.
Some of them were hooded during the encounter.
Nothing more is known about them at present.