My aunt found this skull on the beach in Vancouver Canada. I believe it might be a type of bird, but I can’t place it.
It is about 5 inches (~13 cm) long and 2.5 inches (6.35 cm) wide.
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I recently was gifted a skull just like this. I was very puzzled by it. The link above (if attached correctly 😬) will send you to a fisherman’s blog, where he assembles a Coral Trout skull piece by piece with photos of each step. Quite fascinating. The piece that you and I have seems to be the “forehead” of the fish. The rest of the fish head has many other, smaller pieces to it.
The skull I received is from a beach in Washington State. Can’t be sure the exact species, but this is the closest to an answer I have gotten.