If you see a breakfast menu where the omelets are made of seagulls' eggs, beware. As the blog Umami Mart points out, seagulls' eggs are not really eggs at all, but a Japanese snack called "kamome no tamago." It's cake filled with bean paste and surrounded by white chocolate. Similar to a real egg, there are textural contrasts (between the coating, cake, and bean), and they're high in protein (thanks to the bean). But they probably don't taste as good with hash browns.