• Question: why don't dolphins evolve to have gills?

    Asked by firebreathingtroll to Valeria, Charlotte, Jo, Kevin, Louise on 22 Jun 2012. This question was also asked by heylookitsthatguy.
    • Photo: Joanna Cruden

      Joanna Cruden answered on 22 Jun 2012:

      Simply that Dolphins are mammals and don’t need gills to survive and that is the reason they don’t have them

    • Photo: Kevin Mahon

      Kevin Mahon answered on 22 Jun 2012:

      Their lungs and diving adaptions mean they don’t have to have lungs – they don’t need to take oxygen from the water like fish do, they can take it from the air – Dolphins evolved from the land originally and their lungs are a remnant of this!

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