When the mussel is open – which it is mostly; when it is closed, I get very worried that it has died – there is the odd bit at one end. While the rest of it is covered in this film – I guess it’s like mucous or something – this bit at the end reminds me of whale baleen. We’ve decided it must be where the mussel actually does its filtering work, since there’s nowhere else for water to go in. It’s actually quite exciting.

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