Monday, 16 August 2010

Three small butterflies

Lawns are not very interesting. Green, freshly mown grass may be good for walking on, for playing sport on, and for admiring from afar if orderliness is your kind of thing, but it isn't so useful for creatures. Short, neat stumps of grass aren't great for hiding amongst and don't provide much to munch on, and hence if a field is so manicured that it could be mistaken for Astroturf, it is unlikely to have much living in it. Let the grass grow just a bit longer however, so that the ends tickle your calves as you walk through it, and as if by magic the previously-barren spot will be teeming with life.

All manner of creepy crawlies like to hang out in long grass, from tiny ants and flies to bumblebees and dragonflies. Most colourful, however, have to be the butterflies, which flutter skittishly from perch to perch in search of tasty nectar. Larger varieties such as the Peacock and Red Admiral are easily recognised due to their distinct patterns, but just as attractive are some of the less well-known smaller species. I managed to spot three of the latter recently.

This little fellow is a Brown Argus Butterfly. Confusingly, it is a variety of blue butterfly, despite it not being in the slightest bit blue-coloured (the undersides however are similar). They are most commonly found in the south and east of the UK, preferring to spend their time in chalk and limestone grassland. With a wingspan of only about 25 mm they are about half the size of a Red Admiral and so can be tricky to spot in dense vegetation. If you do manage to clap eyes on one however, you won't have to worry too much about losing it for these are truly lazy butterflies. They rarely travel more than 200 m from the site where they emerged, and like nothing better than to lie around soaking up the heat of the sun. Interestingly, their caterpillars are tended to by ants: the ants provide protection in exchange for a honey-like secretion from the caterpillars’ 'Newcomer’s' glands.

This is another butterfly from the same family, but this time at least the males are actually blue! Such Common Blue butterflies are, as the name suggests, regularly seen all over the UK. They are not fussy about their habitat, and will happily live in gardens, on verges, or even on sand dunes. Similarly, they will contentedly guzzle nectar from all kinds of sources, with thistles and clover is being just two examples of the many plants they feed on. During the day they flap around casually from flower to flower, then at night they become quite sociable, and it is often possible to find a whole group roosting on the same grass stem.

This final specimen is the ominously-named Gatekeeper butterfly. There is however nothing remotely unsettling about it, it is simply a very small (20 mm or so) creature that likes to frequent scrubby grassland. The males tend to pick a shrub they like the look of and from there establish a little territory. The females find a mate and then set off to lay their eggs, of which there may be a couple of hundred. Unlike other butterflies, which tend to get through several generations each year, Gatekeepers only go through one cycle, which peaks at the beginning of August. This time of year is in fact when many butterfly populations peak, meaning that the countryside should be swarming with them. Go out and find some!