Well-fed chicks gain weight rapidly and can triple their weight within 10 days. Chicks stay in the nest 35–54 days before fledging and becoming independent of their parents.

Where do guillemots go in the winter?

Nests on coastal cliffs, mostly in the north of England and Scotland. In winter, it is present offshore around most of the UK's coastline.

How long can a guillemot dive?

Brünnich Guillemots are strong divers, able to reach depths of 150 metres and stay underwater for upwards of 4 minutes per dive. The average dive is between 20 and 40 metres. The Guillemots often venture a long distance from their homes to find foraging – sometimes as far as 100 km away.