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They're interesting to us because they have particular specialisations for catching food, they're a really successful invader in the UK and in Europe, and that might be related to their abilities to solve problems and perhaps dealing with learning in a different way or it maybe a more efficient way than other species do and we know that invasive species tend to be quite clever in a lot of different ways that you measure them. They tend to have slightly bigger brains relative to their body sizes.