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Some days are just good days! On the same day that I finally caught up with the Spotted flycatchers at Cosmeston, I also saw my first Clouded yellow butterflies, and I’d been chasing those for a couple of weeks as well.

170816 Clouded yellow (2)

Colias croceus is primarily an immigrant – it has occasionally been known to overwinter but is usually killed by the cold and damp of British winters – and flies in for the summer months from southern Europe and north Africa. Way back in 1947, there was a huge migration, with numbers estimated at 36,000, but most years the numbers are much less, and this year very few of my butterfly-watching friends have seen any. So, I count myself very privileged indeed to have seen two at Lavernock Nature Reserve last Sunday.