There is a particular seaside Cliff near my home that, for all my life until about five or six years ago, was a favoured nesting site for seabirds of various types. Anyone approaching this spot in those older times would be subjected to the most raucous choir of squawking birds, many of whom would resort to diving at intruders in order to prevent them from coming too close to eggs or nestlings.
Over this short period their numbers have diminished to the extent that there are now no more than a few dozen nesters where once the cliffside was white with droppings, feathers and nests.
Meanwhile we read reports of the pests that such seabirds have become in some of the larger seaside towns and cities ??