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Harbour seals rest gladly on skerries and other small islands. They are usually seen in small groups of ten or more individuals. Seals can even sleep in the water and when they need a new breath they rise to the surface without waking up. |
Harbour seals usually dive to only a few metres for a period of 5-10 minutes, sometimes they can dive to 100 metres and hold their breath for half an hour. |