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| Two males photographed in situ. One typical N.n.helvetica and one possible helvetica/persa hybrid? |
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| Typical British form (N.n.helvetica) |
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| Persa phenotype. |
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| Two males photographed in situ. One typical N.n.helvetica and one possible helvetica/persa hybrid? |
![]() |
| Typical British form (N.n.helvetica) |
![]() |
| Persa phenotype. |