An adult can attain a length of 1.85 m (6.1 ft) and weight up to 168 kg (370 lb).
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Harbour seals can dive deeper than their Grey cousins, diving to 427 meters and staying underwater for almost 30 minutes. However, the average dive is usually a few minutes, going down to 90 meters. They also like to observe humans walking on beaches from the safety of the water, but are wary of humans on land and will rush to the sea if disturbed.