Berger's Clouded Yellow Butterfly, Colias australis, UK, Male Rare summer visitor, Almost indistinguishable from the Pale Clouded Yellow hyale. This species was not recognised until 1947 when a Belgian entomologist, M. Berger, found that the larvae not only fed on Horseshoe Vetch Hippocrepis, but are totally different in appearance, having a brilliantly coloured pattern in black, yellow and green.
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