The peak white is closely related to the
Bath whites but exclusively a creature of high mountains, both in the
Alps and the Pyrenees, flying in a single brood mainly in June and
July, extending into August. Like its relatives it is a fast flier,
wary of approach and not easy to photograph.
The underside hindwing is rather beautiful and absolutely distinctive
when seen, being marked with sweeping chevrons on a green ground.
Nothing else looks similar. From the upperside, the male resembles a
rather weakly marked Bath white, while the female looks like a heavily
marked one! But the whole character of the butterfly is so different -
and the peak white is bigger - that confusion is very unlikely. If you
are on high alpine tundra and a white zooms past it is most likely this
Eggs are laid on various plants in the cabbage family and the species
passes the winter as a chrysalis, well protected beneath the snow!