Look at this:
This is
Macropinna microstoma, a deep-sea fish with barrel-shaped eyes in order to take best advantage of the dim light- they're more like telescopes than eyes. They swivel around on pivots, staring straight up or straight ahead. Those two bumps above its mouth are nostrils. What's more: these eyes are entirely within their own head. Their skull is transparent, a protective observatory to keep its eyes out of harm's way. This is a fish with a window for a head.
Weird? Yes. Odd? Certainly. Stranger than fiction? God damn. And yet it is perfectly believable and scientifically accurate because it is REAL. Plausibility need not and does not deny ultimate oddness.