Small Blue or not Small Blue?

When you’re learning about butterflies and identifying them, and you’ve made one or two howlers in the past, you tend to be a little cautious about flat out, definite identifications. Particularly when the individual butterfly in question is worn around the edges and even more so if you see it at a time when the species in question is not supposed to be about.

According to the UK Butterfly Conservation website, the second Generation of Small Blues normally appear in the third of fourth week of August. I saw this particular butterfly (above) on August 2nd – last Sunday at Tilshead Down – and its tatty condition suggested that it had been around for a good week or more before that. I decided it was extremely unlikely to have been a left-over from the first generation which would normally have petered out by the end June. So if this particular butterfly was a Small Blue and part of the second generation, it had been around getting on for a month before Small Blues were supposed to start emerging.

But looking at the pictures, I can’t see what else it could be.

The following day, I saw the first of the second generation of Common Blues that I’ve seen this year in the area where I normally walk the dogs – I’d been keeping an eye out for them for a week or two. I only saw a couple of them on the two or three mile walk – one male, one female. When they’re in full flow you’ll see dozens in that area. So it looked like the emergence was only just beginning. And the appearance of these two individuals suggested that they may well have only broken out from their respective chrysalises hours before.

Do the clearly visible markings showing through from the underwing suggest that the wings haven’t dried out fully yet, the butterfly having only recently emerged?
Wings looking strikingly fresh on this female Common Blue. And it looks like the forewing on this side is crumpled. Maybe, still stretching out/unfolding from the confines of the chrysalis? (She’s also wearing very smart stripy socks that I haven’t noticed before.)

This was on August 3rd, and the Butterfly Conservation Website suggests that Common Blues (second generation) normally start to emerge in mid July.

So you’ve got a Small Blue appearing getting on for a month earlier than you’d expect it to. And Common Blues appearing maybe a couple of weeks after you’d expect – in a typical year. So no particular pattern. And of course these were isolated, local sightings of no statistical significance, but it did get me wondering about what it might be that affects the timing of the emergence of these different species of butterfly. 

How much of it is down to the weather leading up to their emergence – perhaps affecting the prevalence of their food plants? Can the inhabitants of chrysalises time their emergence to make the most of conditions? And if so, how on earth would they do that?

With the Small Blue I didn’t see any other Small Blues about, so perhaps it was just a mutational aberration. In which case this individual wouldn’t have got to pass on its genes to the next generation. Maybe, when it comes to emerging from your chrysalis, as is the case with many other areas of life, timing is everything. But then again maybe there were plenty of other Small Blues about that I just didn’t get to see, and they were all just ahead of the crowd, having their only little exclusive party.

Tilshead Down. Picture taken a couple of weeks ago. The ‘X’ marks the spot where I saw the Small Blue two weeks later – and a month earlier than expected.

Tiny and Delicate

Britain’s smallest butterfly.

 

Sipping nectar in a daisy cup

I didn’t manage to get a picture of a Small Blue last year. Got close a couple of times, I think. But the “ones that got away” meant getting an identifiable photo of the Small Blue was on my Geek-To-Do list for this year. And a couple of days ago I ticked it off. 

A neighbour who’d promised last autumn to take me this year to a Small Blue site he knew, phoned to tip me off that he’d seen them on the wing the previous day. He mentioned that the butterflies seemed to stop flying after about three in the afternoon, so I’d have my best chance of seeing them if I got there with a bit of time to spare.  Grid reference and directions received, I set off. 

I found the site without any trouble, parked and after a walk of less than a hundred yards, there they were. Once you know where to look, it makes it a whole lot easier to find what you’re looking for.

I was surprised by how relatively easy they were to spot. Tiny though they are, their dark upperwing makes them easier to see than other small butterflies like the smaller skippers with their more neutral, dappled tones.

I saw twenty or more while I was there. Not too many of them were resting with their wings open – I’m guessing they’d done most of their warming up for the day by then – but one or two were. I noticed that the steeply sloping bank of the site was facing East, so it would have warmed up and cooled down a bit earlier in the day than on the flat. Maybe that’s why they were going to roost mid afternoon-ish.

So a good trip. And one that was not just a first for me in getting a positive ID on a Small Blue. I haven’t travelled specifically to see butterflies at a particular site before now either. My interest in the subject has come about as a result of dog-walking locally and happening to live on the edge of Salisbury Plain with its unusually rich variety of wild life. So could this be the start of something new? I can’t really imagine myself being drawn into the world of amateur enthusiast Lepidopterists. On the other hand I know there are Purple Emperors in Savernake Forest which is only about half an hour away…