“I found this in a drawer in my office at a marine biology institute. It looks like an egg, but it’s not.”
Answer: It’s likely to be a dummy seagull egg. The real egg gets swapped with a fake plastic one, so the bird quietly sits on it all season without laying another egg. This technique helps to reduce the population. Besides, seagulls get very aggressive when they have chicks, but they keep calm and quiet when they sit on their eggs.
He's ok.
https://www.reddit.com/r/whatisthisthing/comments/gtelj4/found_these_in_my_cooke
d_spaghetti_the_sauce_was/