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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨

@corysheffield.bsky.social
475 followers 282 following 197 posts

Dad, Royal Saskatchewan Museum curator, #entomologist & #bee research scientist, with a love of #nature, #photography, and #art. Views my own. Bees of Canada: www.beesofcanada.com

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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 22/09/2026
If you need further inspiration to attend #Hymathon2026, look no further @ishymenopterists #hymenoptera
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 17/09/2026
A short note on the proposed subgeneric placement of a peculiar #Australian #bee species just published in @jhr.pensoft.net jhr.pensoft.net/article/2114...
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 02/09/2026
😢 I can not believe this! ansp.org/learn/Journa...
ansp.org
changing-the-future-of-the-academy
The Academy of Natural Sciences will be closing its museum at the end of September, but preserving its research and collections mission.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 23/08/2026
Virginia creeper #leafhopper, Erythroneura ziczac, is a beautiful, albeit somewhat annoying leafhopper that feeds on Virginia Creeper and grapes, for the latter it can become a serious pest. Our creeper plants were so infested that we could not walk by without getting them in our eyes, nose, etc.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 22/08/2026
Two male specimens of Bombus bimaculatus Cresson, with a different colour form shown in each triplet; first three show the typical form, the next three show a male with much more yellow on the abdomen. #bumblebees #beesofcanada
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Reposted by Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨
MondoAB @mondoab.bsky.social · 12/08/2026
What are we doing? "In an urgent and unprecedented plea, five former chairs of the Committee on the Status of Endangered Wildlife in Canada are sounding the alarm about a Carney government proposal that would allow the “wilful extinction” of species across the country." thetyee.ca/News/2026/08...
thetyee.ca
Scientists Warn Carney’s Changes Will Bring ‘Wilful Extinction’ | The Tyee
Proposed amendments to make building ports and pipelines easier could destroy entire species.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 29/07/2026
Funded PhD position studying the impacts of exposure to soil pesticide residues on soil dependent bees with the @nigeleraine.bsky.social lab. 1in3mouthfuls.org/join-the-team/
1in3mouthfuls.org
Join the Team
Vacancies Funded PhD position studying the impacts of exposure to soil pesticide residues on soil dependent bees Project description: we are seeking a highly motivated and enthusiastic student for …
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 24/07/2026
A new paper “Annotated checklist of Scoliidae (Hymenoptera, Scolioidea) of the Americas” just came out. It’s too bad they did not look on @inaturalist.bsky.social as they would have noticed a distribution for Dielis plumipes extending outside of southern Ontario in Canada, some specimens at RSM too!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 24/07/2026
Megachile pugnata, one of about six species of Megachile bee using these nest boxes. This is the largest. #bees #trapnests #beecondos #beenests
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Reposted by Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨
🍁 Alex Smith 🍁 @alexsmithants.bsky.social · 29/06/2026
🧪🧵 🪰 🐜🪲🐞🦗🐛🦋🪳🦟 How many species of insect are there?  A seemingly simple question, but one that has been 'bugging' scientists for years.  Our work out today suggests that there are millions more than we had previously expected.  doi.org/10.1073/pnas... @gdfcf.bsky.social
This photo was taken in Area de Conservacion GuanacasteThis microgastrine wasp was named by co-author Jose Fernandez-Triana in honour of Costa Rican parataxonomist Roberto Espinoza in recognition of his contribution to understanding the plant biology of ACG.  The species is Snellenius robertoespinozai.  The image is Creative Commons Attribution License (CC BY 4.0) so can reused provided the original author (Jose Fernandez-Triana) and the source are properly cited.  The source is: Fernandez-Triana JL, Whitfield JB, Smith MA, Kula RR, Hallwachs W, Janzen DH (2015) Revision of the genera Microplitis and Snellenius (Hymenoptera, Braconidae, Microgastrinae) from Area de Conservacion Guanacaste, Costa Rica, with a key to all species previously described from Mesoamerica. Deutsche Entomologische Zeitschrift 62(2): 137-201. https://doi.org/10.3897/dez.62.5276image of a Malaise trap in Area de Conservacion Guanacaste
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 30/06/2026
I can’t wait!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 28/06/2026
Black #giant #ichneumonid #wasp, Megarhyssa atrata, is a real #beauty!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 27/06/2026
When you find oddly developed #Haskap #fruit, it is easier to see that two #flowers must be #pollinated to get a fully developed #berry. You can see the paired flowers in the second photo.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 23/06/2026
Over a decade ago we visited Quebec’s Îles de la Madeleine and found both Osmia simillima Smith and O. tarsata Provancher, neither species recorded from this archipelago. We are working on a publication of the bees we have found there. #beesofcanada #islands #islandbees #masonbees
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 21/06/2026
Great seeing Nomada depressa Cresson visiting our raspberry patch. I have been watching and photographing this cuckoo for a number of years in my flower garden, and have watched it go in and out of nests of Andrena milwaukeensis Graenicher.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 14/06/2026
Our little #raspberry patch is #humming with #bees today, including #Bombus #Ceratina #Hylaeus and others.
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Reposted by Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨
bioGraphic @biographic.bsky.social · 09/06/2026
Life in the Last Ice Age, as Told by Squirrel Scat Ancient DNA, preserved for 700,000 years in ground squirrel poop, offers a new view of Pleistocene ecology by @moiradonovan.bsky.social www.biographic.com/life-in-the-...
biographic.com
Life in the Last Ice Age, as Told by Squirrel Scat - bioGraphic
Ancient DNA, preserved for 700,000 years in ground squirrel poop, offers a new view of Pleistocene ecology.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 07/06/2026
Osmia are beautiful bees!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 27/05/2026
A side by side comparison of the #bumblebees #Bombus ternarius and huntii. Do you see that the latter has what looks like a mite attached to its body? #beesofcanada
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 24/05/2026
One of our most common spring flying #bees in #Saskatchewan, Andrena milwaukeensis is also one of our most #beautiful, with both the female (first two images) and female (last two images) with fox red hair. #beesofcanada #macrophotography
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 20/05/2026
A great way to end #worldbeeday! At present there are 1039 bee species/subspecies that have been documented from Canada. It takes a while to track down literature records and the specimens, and to review the taxonomy and nomenclature being used, but it sure is worthwhile! #bees #beesofcanada 🐝
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 16/05/2026
A male #Osmia tersula having a rest in a nesting tube. Believe it or not, we had a light snow fall this morning.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 02/05/2026
Systematic review finds resource overlap but few direct effects of honey bees on wild bees www.tandfonline.com/doi/full/10....
tandfonline.com
Systematic review finds resource overlap but few direct effects of honey bees on wild bees
Managed honey bee (Apis mellifera L.) colonies have expanded globally, while wild bee populations continue to decline, raising concerns about interspecific food competition. We systematically revie...
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 01/05/2026
We are excited about our new #research and #collections facility that is in works! www.ctvnews.ca/regina/artic...
ctvnews.ca
Former Regina warehouse to become research facility for Royal Sask. Museum
A former warehouse in Regina will become the Royal Saskatchewan Museum’s new research, exhibits, and collections facility.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 28/04/2026
I am excited to add this to my reading list! 🦖-> 🦅🦆🦜
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 27/04/2026
Though we are still waiting for snow to disappear in much of Saskatchewan, there is some promise of things to come with this Polistes dominula which somehow emerged into our house. I hope to release it outside as soon as things warm up enough! They are beautiful though!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 22/04/2026
This was a cool place to find #nests of #alfalfa #leafcutterbee in British Columbia.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 10/04/2026
I collected this #Bombus terricola in 2015 on the Îles de la Madeleine, an Archipelago in #Québec - I knew of no previous records. Today I found an 1890 publication of Léon Provancher and it was one of two bee species listed. We now know there are at least 5 other #bumblebee species there too.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 09/04/2026
I just identified Ashmeadiella aridula aridula Cockerell, 1910 for the first time from Canada - Grasslands National Park in Saskatchewan to be specific. This species has only been recorded in the western United States. #beesofcanada #beesofsaskatchewan #bees
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 08/04/2026
Some #Bombus suckleyi collected from 1969-2002. It is a #cuckoo of the western B. occidentalis which makes its presence on #Newfoundland so unusual, but it likely also attacks nests of B. terricola. It is seemingly very #rare in Canada, especially in the east #bumblebees #beesofcanada
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 01/04/2026
😢 His 2005 Massey Lecture on HIV in Africa was really impactful for me. We lost a great one! www.cbc.ca/news/politic...
cbc.ca
Stephen Lewis, Canadian politician, diplomat and journalist, dead at 88 | CBC News
Former politician, diplomat and activist Stephen Lewis has died at age 88.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 30/03/2026
#Megachile rotundata will #nest in just about any pre-existing cavity they can find, including abandoned nests of paper #wasps.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 29/03/2026
🧪 #Oxygen supply through the tracheolar–muscle system does not constrain #insect #gigantism www.nature.com/articles/s41...
nature.com
Oxygen supply through the tracheolar–muscle system does not constrain insect gigantism - Nature
New evidence suggests that diffusive oxygen transport through the tracheolar–muscle system is not the limiting factor on insect body size.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 28/03/2026
A descent sized #nesting #aggregation of Anthophora occidentalis in the Avonlea badlands of #Saskatchewan
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 26/03/2026
Did you know that there are over 1030 #species of #bee recorded from #Canada? We keep a tally and catalogue here: www.beesofcanada.com
beesofcanada.com
Bees of Canada, a Royal Saskatchewan Museum Initiative
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 24/03/2026
I really am looking forward to seeing #flowers again in #Saskatchewan, these from four years ago near Walwort
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Reposted by Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨
Dez Fenton @butisitart.bsky.social · 22/03/2026
You know how in a library no one’s trying to sell you anything? That’s how the internet was.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 19/03/2026
I was happy to help out?
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 16/03/2026
🧪 Correlation and spatial concordance between #cleptoparasitic and non-parasitic #bee assemblages across #urban nature reserves within Rome (Italy) resjournals.onlinelibrary.wiley.com/doi/epdf/10....
resjournals.onlinelibrary.wiley.com
Correlation and spatial concordance between cleptoparasitic and non‐parasitic bee assemblages across urban nature reserves within Rome (Italy)
Cleptoparasitic bee richness was positively correlated with both observed and estimated diversity of non-parasitic bees across urban nature reserves in Rome (Italy). Community concordance between cl...
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 14/03/2026
You can find cool things in blue vane traps! Nine years ago we found this beautiful #chalcid #wasp Hockeria eriensis, which was a new record for #Canada (as per Halstead 1990). It is a #parasite of larval ant lions, which were somewhat abundant at this sandy #badlands habitat in #Saskatchewan.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 10/03/2026
It is not often that I see Protandrena from #britishcolumbiacanada and this one appears to be an #undescribed #species (though I believe there is a name forthcoming) #beesofcanada #beesofbritishcolumbia
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 05/03/2026
Five “similar” looking #bumblebee species from one collecting event from coastal #britishcolumbia.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 03/03/2026
While identifying #bumblebees I came across an interesting male of #Bombus rufocinctus. The second image shows the normal head/face of a male, while the head in the second is quite deformed; the right eye/antennae are absent but the exoskeleton is present and is covered with hair. #beesofcanada
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 24/02/2026
🧪 It is going to be a busy year for #cavity-nesting #bee #research. 8000 potential homes for solitary bees just arrived!
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 16/02/2026
🧪 Unraveling the function of the hooked hairs of females of Monoeca species (Apidae: Tapinotaspidini) link.springer.com/article/10.1... #bees #pollination #morphology
link.springer.com
Unraveling the function of the hooked hairs of females of Monoeca species (Apidae: Tapinotaspidini) - Apidologie
Females of all Monoeca species have strong hooked bristles on the mesosomal venter, leg bases, and metasomal sterna (2–4), which suggests that they could be related to pollen collection; however, this...
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Reposted by Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨
Alex Wild @alexwild.bsky.social · 11/02/2026
Entomology Job! Australian native bee systematics:
jobs.csiro.au
Research Project Officer - Hymenoptera
Research Project Officer - Hymenoptera
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 07/02/2026
These wonderful #paintings of #bees were done by Hashime Murayama (1879–1954), a Japanese American painter and scientific illustrator and appeared in the July 1937 issue of The National Geographic Magazine. As much as I love #macrophotography, paintings such as these are such a pleasure to look at.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 27/01/2026
I have been interested in the faunistics of northern #Canada and #Alaska for some time. This lovely volume on the #arthropods of #Greenland is an excellent contribution; the three bee species are covered on three pages, though what was called #Bombus hyperboreus should now be Bombus natvigi.
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 27/01/2026
I drew this for my aunt when I was a teenager before I had any knowledge of archival acid-free paper. It was framed without glass, and received the full range of exposure of dust and smoke from the house it was in. #pencil #art #dogs #sketch
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Cory S. Sheffield 🇨🇦🐝🌺📸🎸🎨 @corysheffield.bsky.social · 22/01/2026
🧪 UAV-based remote sensing of bee nesting aggregations with computer vision for object detection besjournals.onlinelibrary.wiley.com/doi/10.1111/...
besjournals.onlinelibrary.wiley.com
UAV‐based remote sensing of bee nesting aggregations with computer vision for object detection
Our novel application of UAV imagery and object detection models for mapping and censusing ground nesting bee aggregations represents a rapid, cost-effective solution for overcoming limitations in tr....
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