In long-term decline

24 Thursday Apr 2025

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British butterflies, butterfly, declining butterfly populations, Green-veined white, Green-veined white butterfly, Pieris napi

The UK Butterfly Monitoring Scheme recently released its latest report on how our butterflies are faring, and, for the majority of the 58 British butterfly species, the news is not good.

The latest butterfly to emerge in my locale has been the Green-veined white (Pieris napi), which is described by the UKBMS as ‘stable’ but I’m not sure I’d agree with their definition of stable when these are the statistics they list:

Status since 1976 is Stable with a change of -23.1% since monitoring began for this species.
Status over the last 20 years is Stable with a change of -20.8%
Status over the last 10 years is Stable with a change of -35.7%

In fact, on social media, the Head of Science at Butterfly Conservation wrote: ‘One of the big shocks of last year’s UK Butterfly Monitoring Scheme results was that, after its worst year on record in 2024 and a run of six below average years, Green-veined White (Pieris napi) is now in long-term decline.’ This seems a far better summary of the situation. So far, I’ve only seen these two Green-veined whites this year; fingers crossed I manage to see more.

Butterfly courtship

24 Monday May 2021

Posted by sconzani in insects

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Brimstone butterfly, British butterflies, butterfly courtship, butterfly mating, Green-veined white butterfly, Orange-tip butterfly

Some recent moments of butterfly courtship I’ve managed to catch on camera …
The dance of the Brimstones: the butter-yellow male flies in to check if the paler female is ready and willing to mate. And he’s in luck, so their (to human eyes) romantic dance begins, with the male whirling around the female, wafting his pheromones in her direction to encourage her to settle and let mating begin. This ‘dance’ can continue quite a while, as I discovered while watching this pair.

Mating was already underway when I spotted this pair of Green-veined whites. And it is not just sperm that is passing between them. The Butterfly Conservation website reports that the male also transfers ‘a so-called “nuptial gift” of nutrients that the female can assimilate and use to increase egg production. Exceptionally, male Green-veined Whites may transfer 25% of their own body mass to females during mating, though typically this is more like 15%.’

210524 green-veined whites

Sometimes males don’t know when to take ‘No’ for an answer! By pointing her abdomen in the air, this Orange-tip female is refusing to mate, presumably because she has already mated and needs to get on with the important task of egg-laying. But the male simply wasn’t getting the message and continued fluttering around the female, even landing on her outspread wings. Eventually, she flew off at speed to escape his advances.

97/365 Fluttering along

07 Sunday Apr 2019

Posted by sconzani in 365DaysWildin2019, insects, nature, spring

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Tags

Brimstone butterfly, British butterflies, butterfly, Grangemoor Park, Green-veined white butterfly, Orange-tip butterfly, Peacock butterfly

I took myself along to Grangemoor Park today, hoping its central hillock would block the cool north-easterly winds so that I might find some butterflies on the warmer, sheltered, river side … and I did. The three Orange-tips – all males – were my first of the year, as was the single Green-veined white (at least, I think it’s a Green-veined white – I do find the whites can be a little confusing).

190407 orange-tip 190407 green-veined white

The four Peacocks were mostly too zippy to photograph, until I caught one enjoying the sunshine on a wooden railing. And the two Brimstones were also speeding along the edge of the pathways, until one stopped to refuel and I managed to grab a couple of snaps of it. I love butterflies!

190407 peacock 190407 brimstone

Birding at Cefn Cadlan and Cwm Cadlan

17 Thursday May 2018

Posted by sconzani in birds, nature, plants, wildflowers

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British flora, British wildflowers, Cefn Cadlan, Common butterwort, Cwm Cadlan, Dog violet, Greater stitchwort, Green-veined white butterfly, Marsh lousewort, marsh marigold, Micropterix calthella, Native bluebell, Opposite-leaved golden saxifrage, Redstart, Water avens, Wood sorrel

You may be surprised to learn that birding trips aren’t always dominated by birdwatching.

180517 near Cefn Cadlan

Last Sunday’s Glamorgan Bird Club trip saw 22 people striding firstly around the high moorland near Cefn Cadlan, north of Cardiff on the way to Brecon, and then exploring nearby Cwm Cadlan National Nature Reserve, an area renowned for the rare plants that thrive in its wet grasslands.

180517 lane to Cwm Cadlan

Of course, we were on the trip primarily to look for birds – and I saw my first Redstarts for the year (always on distant tree tops) and heard my first Cuckoo (exactly a year since my very first Cuckoo).

You’ll just have to believe me when I say that the dot in the centre of this photo is a Redstart

But, when the birds proved elusive, our team of talented amateur naturalists turned their attention to all the other wildlife and wildflowers that surrounded us. We saw frogs and a hare; speculated on what had left its footprints in the mud; enjoyed all the Green-veined white and Orange-tip butterflies that were nectaring on the abundant Cuckkoflowers …

180517 Green-veined white

and we turned our heads downwards to admire all the special wildflowers that surrounded us. It was a glorious sunny day, the scenery was stunning, and the flora and fauna superb.