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The best way to get close to bottlenose dolphins is in a boat. Chris Packham heads out into the Moray Firth to watch them. A razorbill investigates the boat, flying fast alongside and peering down at the boat. It doesn't take long for the dolphins to find the boat and begin to swim alongside. This population of dolphins is the most northerly on the planet, and also the largest. Their size helps them to avoid the cold water. The dolphins jump, flopping about on their backs and flicking their tails in the air only metres away from the boat. It's difficult to think of animals playing, as their lives are usually so highly strung that taking time out to play is something associated with human behaviour not animals. But the acrobatic leaping does seem to be socially important - it looks like they are just having fun. The scars and nicks on their dorsal fins have enabled scientists to identify 130 individuals in the population here.