One surprising insect important in primrose seed dispersal is ants. They are attracted by a chemical in the flowers and transport the seeds back to their nests where some of them germinate. Learned that from Chris Packham.
It's called myrmecochory and Cyclamen are distributed like this
Well ... that would account for the fact I have cyclamen all over the place too, despite never having planted any of these either. 😁
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In the sticks near Peterborough