An especially popular killer whale put a dead fish on his head, in a throwback to a fashion last seen in the 1980s.

The salmon hat craze was first observed in 1987 when a female orca in the Puget Sound area of the northeast Pacific was seen carrying a solitary dead fish on her nose. Within a few weeks the behavior was picked up by members of other pods, suggesting something about it must have appealed.

The fashionistas of the ocean have spoken, and it’s official -- salmon hats are making a comeback among orcas.

Orcas off the coast of Washington State are balancing dead fish on their heads like it's the 1980s, but researchers still aren't sure why they do it.

Sometimes, nature surprises us with behavior that feels more like a quirky human trend than an animal instinct. That’s exactly what’s happening off the Pacific Northwest coast, where orcas are once again donning “hats” made from dead salmon.

Though researchers have some best guesses, nobody seems to know for sure why exactly a killer whale in Washington state was wearing a dead fish as a hat.