Several years ago, we accidentally started a tradition.
Since 2012, we’d been gradually working our way around the country spotting all the British species of butterfly. This is by no means something new; there’s even a book written which chronicles one person’s quest across Britain to see each one.
In our case however, it sparked an obsession which would bring us back to the Isle of Wight each May/June, and draw us deep into the intimate world of butterfly behaviour; namely that of the Glanville fritillary. This marmalade, black and white butterfly captivated Paul in particular. Personally I can’t say the Glanville is one of my top three favourite butterflies in terms of beauty alone – small blues, wood whites and purple emperors have that prestige.
However, the story of the Glanville fritillary – and the stories of people intertwined with this little orange insect’s tale – are somewhat compelling. And I fell in love with the dramatic chalk coastal landscape of the Glanville’s last natural stronghold. The Isle of Wight embraced me with its fascinating botany and rockpools brimming with fascinating finds.
And so the Glanville became symbolic to me, even though it’s not my favourite insect. It became so, because such was Paul’s love of the butterfly, that we return each year to study them, photograph them, and indulge my other natural history interests. The Glanville’s flight period coincides with the flowering periods of many rare plants of interest, so the annual pilgrimage has become rather a packed and much looked-forward-to natural history trip crammed into the space of usually two days. In our many hours of watching this beast, we’ve learnt many things, and learnt many wonderful stories over the course of the past few years.

The Glanville fritillary (Melittea cinxia) is named after the tragic Lady Eleanor Glanville. Eleanor was one of very few female entomologists born in the 17th century, and as such, she was viewed with disdain and suspicion – women with such avid interests in wild creatures must surely have been dark sorceresses, so people thought. Eleanor had a particular fondness for butterflies. But the Scientific Revolution was a man’s world. Men were the gleaners of scientific knowledge, collectors of insects, writers of books. And women were domestic beings. Those who sought intellectual pursuits, particularly those of biology, were not only treated with deep suspicion, but scorn and ridicule. Lady Glanville’s field activities of searching the hedgerows and meadows for insects would have been looked upon as a sort of madness, uncouth and deeply shameful.
In 1690, she was widowed. Being from a wealthy background, she quickly married again, but her new husband was violent and the marriage proved traumatic for Eleanor. When the marriage finally dissolved, her estranged husband sought to rob Eleanor of her estate, and and he even turned Eleanor’s first child – a son named Forest – against her. When Eleanor died in 1709, there was much battling over her will. Forest successfully contested the will, on the wrongful basis that she was not sound of mind. We now look back at Eleanor as a victim of great injustice and, certainly a victim of the times she lived in. She was just a highly intelligent woman with a scientific, enquiring mind who loved the natural world; what could possibly be wrong or mad about that?
Perhaps we now feel somewhat vindicated on Eleanor Glanville’s behalf, when we hear her story and know that this exquisite marmalade butterfly is named after her. She did after all discover the butterfly, in Lincolnshire. As such, its name was the “Lincolnshire fritillary” prior to the insect being later renamed in her honour. I fancy that she would feel immensely proud of the butterfly’s new vernacular.
When we think of the fact the butterfly’s range extended as far as Lincolnshire, it tells us of how far its UK range has receded. Original populations of Eleanor’s butterfly were found across England as far north as Lincolnshire, on suitable areas of habitat; open grassland with ample bare disturbed ground with an abundance of ribwort plantain (the butterfly’s main larval foodplant). Ribwort plantain is a common, ubiquitous plant, so the reasons for the decline of the species isn’t a simple case of disappearance of foodplant; it is far more complex and the reasons behind the steep and worrying decline are the subject of much study. Butterflies are highly sensitive to climate conditions, so the reasons are likely linked to climate change in conjunction with increasing habitat fragmentation and shrinkage; particularly that of warm, south facing chalk downland with disturbed ground where ribwort plantain also grows. This combination of factors is perhaps the catalyst.

Whatever the specifics of the reasons for the vanishing of the Glanville, what we do know is that it is on the edge of its geographical range, in the UK. Restricted to the south coast of Isle of Wight, this is the last place where it can be found naturally. Deliberate, unauthorised reintroductions have had mixed success in scattered locations in Southern England. And colonies appear and disappear on the Hampshire mainland from time to time. It is one of the UK’s rarest and most threatened species of butterfly.
The habitat conditions on its last remaining stronghold appear to be maintained largely by the processes of coastal erosion and disturbance on the soft maritime cliffs and chines. These environmental processes are classic of this part of the UK. The warm, south facing soft-stoned chines, undercliffs and downs of the Isle of Wight are battered by the elements and undergo repeated disturbance, exposing bare ground that warms in the sun and sprouts young ribwort plantain by the bucket load – just what the Glanville needs. By the same token however, the butterfly is vulnerable. Violent storms and landslips can wipe out larval webs, and areas of ribwort plantain laiden with eggs can be washed away into the sea. Sudden spells of prolonged, cold, rainy weather can greatly hamper the Glanville’s opportunity to mate and lay eggs – after all, the adult butterfly only has a week or two (it’s adult lifespan) to make hay while the sun – literally – shines.
So you could say that the Glanville lives on somewhat of a precipice. I have to say, however, that in our years of watching the butterflies, and in talking to enthusiasts about them, we’ve learnt some absolutely fascinating things about the resilience of this butterfly on the edge, and how they have adapted to this precarious existence.
A local lepidopterist we spoke to, discovered that caterpillars of the Glanville take refuge in the safety of tiny crevices and holes in stones and pebbles; what an amazingly fine detail of nature to witness. Furthermore, the eggs of the Glanville fritillary are surprisingly tolerant of saline conditions, meaning they can withstand a degree of spray from waves, in stormy times (provided they aren’t washed away completely into the sea, I suppose..)
And so, the Glanville fritillary has its boom years, and its bust years. In their years of plenty on the Isle of Wight, they can be counted in the hundreds. In other years, their low numbers have lepidopterists worrying about localised extinctions. Butterfly enthusiasts and naturalists flock to the Isle of Wight each May/June in the hope of spotting and photographing this rare gem. In the warm sunshine of the middle of the day, they can be frustrating butterflies to photograph, though. They are busy and pugnacious insects, quick to battle with so much as a fly that dares to buzz too close. On hatching, they set about their business of nectaring, mating and (in the female’s case) egg laying, as soon as their intricately patterned wings are inflated. If you live for no more than a couple of weeks, you’d better get cracking with business, so there’s little time to sit still in the daytime.
This can prove frustrating for the observer or photographer. This frenetic existence is busy and tiring to watch! But we soon realised that we could enter into a more sedate and relaxing side of the life of this fast living creature, by venturing out into its world in the evening – something we hadn’t thought of before, and something we’re not sure many other butterfly enthusiasts do.
Watching grassland butterflies by evening is a world away from the busy, bright buzz of the day. It’s an ethereal, magical and intimate natural history experience. When we head down into the chines of a late May evening, the beaches are quiet, the tourists have headed back to their pubs and hotels, and we feel as though there’s just ourselves with our lepidopteran subjects and the sounds of the waves lapping at the shore. The pugnacious, bright-orange winged fritillaries of the earlier sunshine are now in what we believe is their most beautiful state – at peaceful roost. Dotted on every other grass head, is a ‘sleeping’ Glanville or two, wings closed, perfectly showcasing the most beautiful underwing of any British butterfly. It’s a crazy-paving style, dotted affair of magnolia, orange, white and black; each individual’s exact pattern is unique, like our fingerprints. Sometimes the black lines are broken, and sometimes the whites more stained with yellow. When you happen upon a patch of ‘sleeping’ Glanvilles in abundance, it’s a glorious spectacle.


Picture the dramatic chine spattered with soft pink thrift, the sun setting over the turquoise sea, and dozens of postage-stamp sized butterflies folded up to roost on the grass stems. This year one evening, I sat down to relax beside the footpath and I began to lose count of them. When they’re at rest like this, you can get up close and personal. You can see every scale and hair, the fluffy fringes on the wings, the banded antennae. The flighty, restless creature of the daytime sun is now face to face with you, unflinching, though it seemed so wary of you earlier. You are surrounded by these pugnacious, tenacious butterflies on the edge, in their peaceful state.
Just be careful not to go off-piste and tread on the young plants of ribwort plantain on which the eggs have just been laid – the Glanville may be tough, but respect for wildlife is paramount and habitat disturbance is an easily avoided problem.
So what does the future hold for this butterfly on the edge, with its precarious existence and concerning conservation status in the UK? No one can really know, though there is much speculation. It seems that the butterfly can be relatively resilient in its final stronghold on the Isle of Wight, often bouncing back from its poorer years, withstanding occasional seemingly disastrous weather events, and colonising new patches of disturbed coast on the island from time to time. But climate change and other pressures could change all this in the future, as is the case with so many species. There is however one thing I can be sure of. In my lifetime I will see this Isle of Wight icon every May for as long as both it – and I – exist.
