Rachel Yung and her family were on holiday in California, USA, in the summer when she posted this incredible video.
During their stay they went on a boat trip in the hopes of maybe seeing a dolphin or two.
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Not only did they see a few dolphins, they were lucky enough to see a whole school of them ducking and diving alongside their boat.
The beautiful animals can be seen popping up next to the boat for at least thirty minutes according to Rachel.