The 7.3-foot (2.2 meter) hoodwinker sunfish first appeared on the beach in Gearhart on Monday, the Seaside Aquarium said in a media release. It was still on the beach on Friday and may remain there for weeks, the aquarium said, as it is difficult for scavengers to puncture its tough skin.

Photos provided by the aquarium showed a flat, round, gray fish lying on its side in the sand. Photos of a person kneeling next to it, and another of a pickup truck parked next to it, gave a sense of its large scale and size.

The stir it has created on social media prompted a New Zealand-based researcher who has studied sunfish to contact the aquarium. After looking at photographs of the fish, Marianne Nyegaard was able to confirm that it was indeed a hoodwinker sunfish—rarer than the more common ocean sunfish—and said she believed it may be the largest such fish ever sampled, according to the aquarium.

In research published in 2017, Nyegaard discovered through genetic sampling and observation that the hoodwinker sunfish, or Mola tecta, was a different species than the ocean sunfish, Mola mola. "Tecta" in Latin means hidden or disguised, referring to a new species that had been hiding in plain sight.