Eaten Primroses

[paross]

I have several clumps of pink and lemon primroses that have been flowering
for a couple of months but something is eating the petals! What is it and what can I do? I never catch anyone in the act.

[heathfield]

Sparrows like them.

[Robinia]

Yes, most likely to be birds, they really like the yellow ones. I'm giving up planting them, I've got one dog eared blue one left.