I really like gulls, and I think if you're only used to seeing them raiding bins around cities or being menaces in coastal towns, you're potentially missing out on how cool and well adapted these birds are to living as scavengers and opportunistic predators in coastal and inshore habitats. It's likely no surprise to learn that gulls were our number one fans when I worked on fishing boats and they would happily follow our boat just waiting for the chance to steal bits of our catch when the nets were hauled in. Like the majority of seabirds, adult gulls will typically raise one or two chicks per year, and, depending on the species may be serially monogamous (i.e., they will form a pair-bond for one entire breeding season, but may change partners in different years), or may form stable, long-lasting pair-bonds with a partner that can last over several breeding seasons.
Skuas (jaegers) are kleptoparasites and opportunistic predators, meaning that they will eat a variety of food types, and will also be more than willing to mug other birds and steal their prey from them, including forcing the other bird to regurgitate its last meal in some cases. In this gallery, I have a sequence of photos showing a great skua's failed attempt at mugging a terrified gull behind our fishing boat in the north Minch.