Late Summer On The East Sussex DownsYesterday (24th July) I headed over to my favourite part of East Sussex - the Downs around the beautiful Cuckmere Valley. First stop was Windover Hill, with the steep climb affording wonderful views back towards Firle Beacon. At this time of year the now sun-baked agricultural landscape of The Weald shimmers through the heat-haze.
View towards Firle Beacon
On the chalk track towards the summit I encountered Chalkhill, Small and Common Blues, Brown Argus, Marbled White and a Dark Green Fritillary. But it was Grayling I was after, which sadly is a highly localised and far-from-common species in Sussex these days. I then descended into the valley behind Windover - Grayling country.
Grayling country
It wasn't long before I encountered the first of these fascinating butterflies, sweeping powerfully across the slopes on V-held wings, searching tufts of grass, scrapes of bare earth and rabbit burrow entrances for virgin females. They have only recently started to emerge here, so out of the dozen I saw, only one was a female. This is Michael Blencowe's favourite butterfly; to the extent that not only has he adopted it as 'Species Champion' for the Branch - he runs an annual 'Sussex Grayling Festival'!
Male Grayling
Female Grayling
I then moved a couple of miles to Frog Firle, descending into Cradle Valley - a real butterfly 'hotspot'. It wasn't long before I found my second target species of the day, the Silver-spotted Skipper - about 20 of them. Of these, a significant proportion were females, with the usual high speed pursuits, crash landings and abdomen-curling in evidence as the males 'tried it on' relentlessly.
For the third year running I watched some macabre goings-on here. The Hornet Robberfly (
Asilus crabroniformis) was on the hunt for skippers, and I saw one successful kill. Predatory insects develop highly-tuned hunting skills, usually only attacking while their prey is off-guard. Wasps tend to ignore butterflies most of the time, but if they come across one ovipositing it often results in a lightening-fast attack. Hornet Robberflies would probably be no match for a SSSk in 'level flight', but a split-second of vulnerability arises when a skipper lands, and is unready for simultaneous take-off. It's now that the robberfly pounces, usually resulting in a near-miss, but occasionally leading to a gory end. The robberfly doesn't take long to drain all the juicy bits from the skipper.
