* Twigs and sticks: These provide the basic structure of the nest, and are woven together to form a sturdy framework.
* Grass, seaweed, and other plant material: These materials are used to line the nest, and provide insulation to keep the eggs and chicks warm.
* Feathers: Feathers are used to further line the nest, and help to keep the eggs and chicks dry.
* Rocks, shells, and other debris: These materials are sometimes added to the outside of the nest, and may help to camouflage it.
Seagulls will often gather these materials from a variety of sources, including the beach, the surrounding vegetation, and even from human settlements. They will also sometimes reuse old nests, or materials from old nests, when building new nests.
The size and shape of a seagull's nest will vary depending on the species, but they are typically round or oval in shape, and can range in size from small nests just a few inches in diameter to large nests that are several feet across.