Most people with an interest in the natural world have probably, at some point, come across the term ‘shifting baseline syndrome’. It’s a neat way of expressing a well-known phenomenon: that we almost invariably use the world we knew in our childhood as a point of reference. Thus any changes we’ve witnessed in our lifetime will always be compared against this baseline. It’s an interesting, and totally understandable, quirk of human psychology.

I am as guilty as anyone of doing this (though in my defence, I’m at least self-aware enough to realise that I’m doing it!) – and can’t help comparing the world I see now with the world of my youth. Now we all know that nature has generally been in freefall for much of the past hundred years (and especially the past fifty), and as a result my own baseline (late 1980s-early 1990s) doesn’t exactly represent a golden age of biological diversity. That said, compared with today’s world, I’m sorry to say it does elicit a melancholic pang of nostalgia: a ‘delicious sadness’, as the naturalist Gerald Durrell once wrote.

Memories from this time come back with surprising, sometimes alarming clarity. Beakers of lemonade served on the back steps in scorching sunshine. Travelling by train in the dying days of BR, on faded velour seats behind clapped-out locomotives. Australia marmalising England in countless Test matches, coming through the long-wave radio in Dad’s Ford Escort. And most poignantly, all that wildlife, that I naïvely just took for granted.
Anyway, I promise there’s a relevant point to this ramble down memory lane. Back in the land of the here and now, we’re currently experiencing the best summer for a long while in terms of weather (mostly) and wildlife (definitely). This past week I have been unable to resist making comparisons with the summers of my childhood, but for once in a good way. Basically, this boils down to two things: sunshine and butterflies, both of which have been in unusual abundance at Forvie in the summer of 2025.

A quick walk from Collieston to Hackley Bay on Tuesday produced, without any real effort on my part, eleven different species of butterflies. At our latitude, that’s not too shabby at all, given that flying-insect diversity generally decreases the further north you go in Europe. But more than this, it was the numbers that were impressive. Rather than the odd ones and twos that we’re used to, this year we’re seeing butterflies in the sort of abundance that I recall from my youth: the very best kind of throwback.




Among the throngs of Red Admirals and Small Tortoiseshells – great to see these present in good numbers once more – Painted Ladies have been very much in evidence. This is something of a boom-and-bust species at Forvie; in some years we hardly see a single one, while in other years they can be super-abundant (the last year this happened was 2019 – or as we fondly call it, the Dave Pickett Era). This feast-or-famine pattern of occurrence is due to the vagaries of wind and weather, allied to the butterfly’s remarkable (bordering on unbelievable) life strategy.

The Painted Lady is a multi-generational, long-distance migrant. That is to say it migrates over vast distances – from sub-Saharan Africa north to the very edge of the Arctic Circle – in a series of shorter ‘hops’, each one undertaken by a new generation of butterflies. The first generation hatches in central Africa, then moves northwards to Morocco when it gets too hot south of the Sahara. Here they breed, and the resulting offspring then head northwards into Europe. Two or three generations later, if prevailing wind and weather conditions are favourable, what are perhaps the ‘great-grandkids’ of the original African butterflies make landfall here in Scotland, having crossed the North Sea in the process. And that’s what we’re witnessing right now at Forvie.

As if this wasn’t amazing enough (I mean how can a butterfly weighing less than a gram, with a wingspan of less than 6 cm, cross the North Sea or the Sahara Desert?!), it’s the last part of the Painted Lady’s life story that’s the really mind-blowing bit. What’s more, it was a mystery only solved within the past twenty years.
The key point to note here is that the Painted Lady can’t survive the Scottish winter, in any part of its life cycle (i.e. egg, caterpillar, pupa or adult). Consequently for years it was thought that the later generations of the butterfly were basically heading down a dead-end road, in the literal sense, on their northward migration. However, studies carried out in 2009 – another big Painted Lady year in the UK – employed ground-based radar to track the flying butterflies.

By these means, scientists established that the Painted Ladies didn’t wait to meet their inevitable fate in the British winter – instead, they upped and left for Africa. Ascending to altitudes of 500 metres and more – which explains why the phenomenon has never actually been observed by the human eye – they hitch a free ride on prevailing tail-winds, to end up right back where their ancestors started out in central Africa, a journey of 7,000 miles or thereabouts. In 2009, it was reckoned that 11 million Painted Ladies arrived in the UK during the 2009 study, while a whopping 26 million departed southwards in the autumn. Clearly, the long journey north (and thence south) is worth it for the seasonal glut of food available to the butterflies in northern Europe. It’s a strategy that works – however unlikely it may seem.

So when you’re walking the paths on the Reserve and seeing these butterflies zipping around, and supping nectar from the thistles and knapweeds, you’re seeing one of the true miracles of nature. Not that we even knew that during the heady days of my youth! Now, as then – and regardless of any shifting baselines – there’s so much more for us to learn about the world in which we live.








































































































































