Herring gulls are good at producing all three eggs into flying birds. This means that at least one (often two) of the newly flying chicks loses both its parents within days after first flight. Some of these can later be seen in flocks of smaller gulls like the black-headed gull ("Chroicocephalus ridibundus") or the common gull ("L. canus"). They are probably not welcomed in such flocks, but follow them for some months, anyway, and do thereby learn where to find food. Lonely juvenile herring gulls born in urban environments can also be seen staying for a some weeks close to outdoor restaurants and similar facilities, squeaking and begging for food from humans. By November or December, most juveniles have found other "flockmates", usually in areas near water.