Previous Events

'Can Butterflies find refugia from climate change'

presented by Dr Andrew Suggitt on 31st January 2022 at 19:30

Andrew is actively involved in climage change research studying the increasing risk of extinction for cold- or wet-dwelling butterfly species. It is thought that up to a sixth of all biota faces worldwide extinction by the end of the century. However, evidence from the last glacial maximum suggests that affected species might survive in refugia, areas with an atypical climate (or microclimate) that buffer species from the worst of these changes. In this talk, Andy will describe some early results from a national survey of four northern butterfly species thought to be possible beneficiaries of this so-called refugial effect.

'The Purple Emperor: an Idiosyncratic Species'

presented by Dennis Dell on Monday January 17th 2022 and 7.30pm.

Dennis is one of the foremost UK authorities on the Purple Emperor , our most iconic butterfly and is closely monitoring this expanding species just a few miles short of the Yorkshire border. It is possibly one of the most difficult species to confirm its presence because of its many Idiosyncrasies. Maybe it is already among us and Yorkshire has fallen and become part of the Purple Empire.

'The Conservation Status of the Duke of Burgundy Butterfly' with Steve Kirtley

Steve takes a deep dive into the life of this tiny but fascinating threatened Butterfly species. With 30 years experience working on its conservation on the North York Moors he knows better than most the exacting requirements needed to conserve this species and for it to thrive on a small number of sites mainly on private land on the southern edge of the North York Moors in the Helmsley and Pickering areas. Over many years now a small dedicated team of people have been carrying out annual site management and recording with the support of the landowners and the North York Moors National Park

'Moors and Valleys - Butterflies of Swaledale' with Catherine Jones

Explore one of the most delightful areas of Yorkshire where life runs at a different pace and nature steps back in time. From the craggy heights of Whitcliffe above Swaledale to the near wild moorland; Catherine Jones has a unique perspective on this wonderful mixed landscape. Catherine, who was previously a botanist and has always been passionate about butterflies and moths, is fascinated by the unique, often hidden, flora and fauna of this ancient valley.

'Discovering Yorkshire's Butterflies' with Nick Hall

From attracting butterflies into your garden, raising caterpillars and moth trapping to venturing out into your local area and beyond using fieldcraft and research to find out more about our local area. How to use the BCY website, sighting system and the online atlas in planning a visit to a local site. Tips on spotting our more elusive species and using fieldcraft in and out of season to give you the best chance of seeing a species

Wednesday 14th April 7.30pm : 'The Atlas of Britain & Ireland's Larger Moths' with Zoe Randle

The Journey to and key findings of the Atlas of Britain and Ireland’s Larger Moths" with BC's head of recording Zoë Randle. Zoë describes the journey to the publication of this landmark publication and the key findings of the work.

'Becoming a UKBMS Transect Recorder' with Dr. Terry Crawford

If your thinking about becoming a transect recorder or taking on a WCBS square or just need to hone your skills ready for the new season you will find this useful. Terry leads you through the fundamentals of the Pollard Walk, judging minimum conditions to walk and species ID's, concentrating on the tricky ones to tell apart. Designing a Transect and data entry into UKBMS is also covered.

Below are the PowerPoint presentations that Terry has kindly allowed to be shared with everyone..

Butterfly Identification for Transects.pptx
Zoom talk on UKBMS.pptx

Yorkshire UKBMS Transect Recorder Annual Meet-up with YBC and YWT

A Joint meeting with Yorkshire Wildlife Trust and chaired by Philip Whelpdale (Data Manager for YWT The aim was to bring all of Yorkshire Butterfly Transect recorders together and introduce Nick Hall as the new transect co-ordinator. Nick talked about where our data goes to and how it is used and then looked back at 2020 season. He highlighted general trends in species and sites and the meeting went on to detail individual transects sites and their 2020 results and feedback from transect walkers. Finally Nick Hall presented an overview of transect recording in yorkshire, how well we compare with other counties and a strategy going forward with a 3 year plan of objectives. 37 transect recorders attended representing 40 sites.

Introduction to Yorkshire Branch of Butterfly Conservation

Our first online event was special; held to allow our members to meet those closely involved with helping conserve Yorkshire's species and key people within our branch, including committee members, recorders, and BC regional staff and he ar what they are involved in. BC Yorkshire wants to ensure we are doing the best possible job for our members, as well as our butterflies If you watch our video we do want to know what you think of our efforts so email

'The Dark Skies Festival' : 'The Dark side of Street Lighting' with Dr Callum Macgregor

'The Dark side of street lighting' As part of the 'Dark Skies Festival' a webinar presented by our colleague Dr Callum Macgregor and his work on light pollution and its effects on moths at Hull University.

11th February: YNU online meeting : 'Movement north of Brown Argus' with Dr Martin Partridge

Martin Partridge chair of BC Yorkshire made an enlightening presentation on the 'Movement north of Brown Argus' full of animated maps of range its spread and host plant distribution bringing together the science and biology of this particularly curious species that has 'flipped' host plant to Doves Foot Cransebill to combat decline in its normal host Rockrose. This was followed by a lively question and answer session and an enthralling masterclass on the use of QGIS while answering questions frpm the audience . Recording below click to play:

NB you can expand the box using 'pop out' arrow and then press play and then go full screen (if you wish) from the menu

You can download a copy of the article HERE or view below

Brown Argus BBC Radio Leeds 17.02.2021.mp3

Hear the radio interview with Martin talking about the movement of Brown Argus on Radio Leeds

Brown Argus and its move North.pdf