In a largely cloudy wet summer in these parts the sightings of butterflies are all the more precious. As an ‘ectotherm’ these insects need warmth to fly for any duration. So on cooler days they need to open their wings to sunlight and heat their bodies to about 29C before take off. Slopes with wildflowers on them facing the sun are particularly great places to see them.
Populations of these absurdly beautiful creatures are falling the world over because of climate swings and pesticide use – another reminder that apart from robins, goldfinches, magpies, deer and rats, etc, it’s quite hard to write about many facets of the natural world without doom and gloom encroaching, but that’s the reality. Take the small tortoiseshell butterfly: its numbers have declined because its larvae need to feed on wet leaves (mainly of nettle), so the increasing tendency toward drought has really hit its population over the past 40 years or so. The large tortoiseshell meanwhile has nearly completely vanished. Having said that, other species, such as silver washed fritillary, are said to be expanding if anything.
However, Kent walks near London are graced at the moment by a variety of lovely species: on the chalk North Downs you’ll see silver washed fritillaries, the small but smart brown argus (actually classed as a blue), dark green fritillaries (if you’re very lucky), gatekeepers, marbled whites and meadow browns, plus many of the common names such as the incredible migratory painted lady, red admiral, brimstone, tortoiseshell large and small and a host of others. Chalk hill blue, the common blue and the adonis blue (very rare) are particular favourites. It might just be me but I tend to see more orange tips, peacocks, commas, brimstones and large whites on the Greensand Ridge walks around Sevenoaks, but I’m not being scientific here – they are widespread.
To see wonderful butterflies you might not have leave your garden or park as we all know – now the prolific south-east London buddleia is in flower, the migratory red admirals are often seen a-flutter in the suburban streets. Small species, like skippers, I don’t know much about. But I often see gem-like butterflies on the walks – I’d need to be with an expert to identify them.
It’s hard to photograph butterflies because they are rather skittish unless in the mood for a bit of showing off, or just super drunk on nectar (is that possible?) but I have managed to take a few shots over the past couple of years, which I’ve compiled in this montage above (the chalk hill blue centre right was taken by a friend though).