An entry from MyLittleNorway.com says that seagull eggs are 2-3 times the size of a normal chicken egg. On average, chicken eggs are about 5.7 centimeters. From that, seagull eggs are around 11-12 centimeters.
Different eggs via
Seagull eggs has a grayish-brown color with dark spots (similar to quail eggs). Most seagulls build their nests on the ground and have a clutch size of about 1-3 eggs.
Seagulls are a type of sea bird belonging to the family Laridae and there are over 20 species around the world. In some countries seagulls are treated as pests because they are noisy, release large quantities of droppings and destroy private properties.
Here are some news from the Mirror.co.uk and the DailyMail.com on why they are becoming a problem.