Secret Pollinators

Can a wild bee really disappear for 144 years? A volunteer with a net just proved the answer is stranger than you'd think. We follow the rediscovery of a wool-carder bee last recorded in the 1800s, a sweat bee unseen since 1906, and a never-before-documented "charming mining bee" caught in the act with a load of pollen — all turned up by trained volunteers running the first statewide bee survey in Washington in over a century. The real revelation isn't that these bees came back. It's that they never left. We just stopped looking. Find out why the map of America's 4,000 native bees is still half blank — and how you might help finish it right where you live.

www.secretpollinators.com

KEY SOURCES

• • WSDA news release: "Washington Bee Atlas finds 17 new state bee records; rediscovers 12 species last recorded in the state as long as 144 years ago" (March 2026). agr.wa.gov
  • U.S. Fish & Wildlife Service feature on the same findings (March 2026). fws.gov
  • OPB / KUOW (John Ryan), "Bee survey finds dozens of species new to Washington state" (March 26, 2026) — ~50,000 specimens; 30 new-to-state species; 14 unseen 50+ years; the wool-carder bee (last recorded 1882), the sweat bee (since 1906), the charming mining bee. opb.org / kuow.org
  • WSDA Pollinator Program / Washington Bee Atlas — first statewide survey since the early 1900s; ~600 native species; OSU Master Melittologist training; specimens housed at WSU's M.T. James Entomological Collection (est. 1892). agr.wa.gov/pollinators
  • ~4,000 native bee species figure: callback to E48 (USGS / Xerces estimates).

#SecretPollinators #NativeBees #WildBees #Pollinators #CitizenScience #BeeAtlas #Melittology #MiningBees #WoolCarderBee #NativePollinators #PollinatorConservation #WonderInTheGrass #Carderbee #Bees #WashingtonBeeAtlas #BeeAtlas #iNaturalist

Happy Pollinator Week! Tell someone you love native wild bees and they'll start talking about honey every time. But the honey bee is a European import — it's not even one of the four thousand native wild bee species that live in the United States. This is a short, joyful one: a celebration of the bees most people never notice, the ones in every parking lot and sidewalk crack, the ones already under your feet. They are docile and some of the best pollinators in the world. Four thousand shapes, four thousand quiet lives. Once you see them, you can't stop.

www.secretpollinators.com

KEY SOURCES

Species counts

• • U.S. Geological Survey — "How many species of native bees are in the United States?" (4,000+ US native species; world's smallest bee ~2 mm). usgs.gov
  • Xerces Society — "Bee Species Diversity in the US" (3,600+ species US & Canada — conservative regional figure). xerces.org

Honey bee as non-native; solitary / ground-nesting life

• • Scientific American — "There Are 4,000 Species of Native Bees in the U.S." (no native bees make honey or hives; most solitary). scientificamerican.com, Apr 2026
  • National Geographic — "Why America's 4,000 native bees deserve more attention" (~4,000 wild species; ~70% ground-nesting; size range). nationalgeographic.com

Deep-time / "ancient" framing

• • Bossert et al. / WSU — "The Evolutionary History of Bees in Time and Space" (bee lineage dates back 120+ million years; origin in Western Gondwana, later dispersal to northern continents). news.wsu.edu; ScienceDirect
  • Museum of the Earth — "Evolution and Fossil Record of Bees" (bees evolved from predatory wasps ~120 mya). museumoftheearth.org

Pollinator Week & community science

• • Pollinator Partnership — "Pollinator Week" (June 22–28, 2026; initiated and managed by Pollinator Partnership). pollinator.org/pollinator-week
  • Pollinator Partnership — "Pollinator Week Activities" (Pollinator Week Bioblitz hosted on iNaturalist; community science collecting native pollinator distribution data across US, Canada, Mexico). pollinator.org/pollinator-week/activities
  • iNaturalist — free observation app feeding research-grade biodiversity records. inaturalist.org

#SecretPollinators #NativeBees #WildBees #BumbleBees #PollinatorWeek #iNaturalist #PollinatorPartnership #NativePollinators #BeesOfNorthAmerica #SolitaryBees #CommunityScience #PollinatorScience #BeeDiversity #NatureWonder #SciencePodcast #iNaturalist #PollinatorPartnership #gardening

A quick bonus update: how a five-minute email led to an official Montana Pollinator Week proclamation — and how you can get the same thing done in your own state before Pollinator Week wraps up.

www.secretpollinators.com

Resources:

• • State of Montana, Governor's Proclamation, Montana Pollinator Week, June 22–28, 2026 (signed by Gov. Greg Gianforte)

#PollinatorWeek #NativeBees #MontanaPollinatorWeek #PollinatorPartnership #WildBees #SecretPollinators #BeeConservation #Montana #Wildbees #nativebees #Bees #gardening #

It started with one woman's frustration and a unanimous city council vote in Asheville, North Carolina, in 2012. Fourteen years later, more than 400 American towns and college campuses have made formal commitments to become better habitat for native bees.

This National Pollinator Week, we explore what the Bee City USA movement actually does, why the science of solitary bee foraging ranges makes urban habitat networks so critical, and what happens when a city decides to see itself as a landscape instead of just a skyline.

www.secretpollinators.com

References:

Bee City USA history and program structure

• • Xerces Society: "Bee City USA: Galvanizing Communities to Reverse Pollinator Decline" — xerces.org/blog/bee-city-usa-wings
  • Xerces Society: "Phyllis Stiles of Asheville, NC: The Buzz Behind Bee City USA" — xerces.org/news (May 2024)
  • Bee City Asheville: beecityasheville.org/about
  • Bee City USA: beecityusa.org/about

Solitary bee foraging ranges

• • Gathmann, A. & Tscharntke, T. (2002). Foraging ranges of solitary bees. Journal of Animal Ecology, 71, 757–764.
  • Zurbuchen, A. et al. (2010). Maximum foraging ranges in solitary bees. Biological Conservation, 143(3), 669–676. DOI: 10.1016/j.biocon.2009.12.003
  • Hofmann, M.M. et al. (2020). Foraging distances in six species of solitary bees. Journal of Hymenoptera Research, 77, 105–117.

Urban bee diversity and connectivity

• • Lundquist, M.J. et al. (2025). Bug roads: Modeling green space connectivity in NYC. Ecological Applications, 35(7), e70128. DOI: 10.1002/eap.70128
  • Frantzeskaki, N. et al. (2024). Bees in the city: scoping review. Ambio, 53(9), 1281–1295. DOI: 10.1007/s13280-024-02028-1

National Pollinator Week

• • Pollinator Partnership: pollinator.org/pollinator-week

#SecretPollinators #PollinatorWeek2026 #BeeCityUSA #NativeBees #WildBees #SolitaryBees #UrbanPollinators #PollinatorHabitat #NativePlants #BeeScience #IndependentPodcast #SciencePodcast #PollinatorSteward #Bumblebees #MasonBees #HoverFlies #Gardening #NativeBeeHabitat #PollinatorPartnership

A bumblebee leaves her nest with no map, no GPS, and no instructions. By the end of the week, she'll have figured out the most efficient route between every flower patch in her territory — reducing her total flight distance by eighty percent. That's not a metaphor. Researchers tracked it with radar. In this episode of Secret Pollinators, Kelly digs into the hidden navigation science of wild bees: traplines, floral constancy, the multi-scale memory that makes it all work, and why the technology to track solitary native bees is only now catching up to the questions scientists most want to answer. Plus: what the flowers have to do with all of it.

No honey bees. All wild. All wonder.

secretpollinators.com

Key Sources:

Bumblebee traplines and route optimization

• • Lihoreau, M., Chittka, L., & Raine, N.E. (2010). Travel optimization by foraging bumblebees through readjustments of traplines after discovery of new feeding locations. The American Naturalist, 176(6), 744–757. https://doi.org/10.1086/657042
  • Woodgate, J.L., Makinson, J.C., Lim, K.S., Reynolds, A.M., & Chittka, L. (2017). Continuous radar tracking illustrates the development of multi-destination routes of bumblebees. Scientific Reports, 7, 17323. https://doi.org/10.1038/s41598-017-17553-1

Floral constancy in native and solitary bees

• • Shrotri, S., Kaur, S., Nawge, V., Sandhya, S., Dandavate, R., & Gowda, V. (2024). Revisiting Aristotle's observation on bees: High floral constancy is common among bees but it is shaped by the locally abundant flowering species. bioRxiv. https://doi.org/10.1101/2024.10.28.614270
  • Lanza, J., Smith, G.C., Sack, S., & Cash, A. (2019). Honey bee and native solitary bee foraging behavior in a crop with dimorphic parental lines. PLOS ONE, 14(10), e0223865. https://doi.org/10.1371/journal.pone.0223865

Memory and foraging ecology

• • Worden, B.D., & Papaj, D.R. (2005). Flower choice copying in bumblebees. Biology Letters, 1(4), 504–507.
  • Ecology dictates the value of memory for foraging bees. (2022). Current Biology, 32(18). https://doi.org/10.1016/j.cub.2022.07.068

Bee tracking technology — solitary and wild bees

• • Kratschmer, S., Milchram, M., Landler, L., et al. (2025). Tracking large bees in open landscapes with active radio tags — advantages and challenges using stationary receivers. Journal of Animal Ecology. https://doi.org/10.1111/1365-2656.70061

#SecretPollinators #NativeBees #WildBees #BeeNavigation #BumbleBee #FloralConstancy #Trapline #PollinatorWeek #PollinatorWeek2026 #BeeScience #WildPollinator #NativePollinators #BeeResearch #PollinatorSteward #PollinatorPartnership #BeeMemory #Pollinator #BeeFlight #NaturePodcast #SciencePodcast #BeeFlightPath #Bumblebees #travelingsalesmanproblem #solvedbyabee #trapline #beeroutes #beepaths #QueenMaryUniversity

A small seaside town north of Dublin set out to save a vanishing ginger-colored bumblebee — and the way they did it holds a lesson for every gardener, balcony grower, and small-space planter in America. This week we travel to Skerries, Ireland, to meet the large carder bee and the community that built it a home out of wild meadows. Then we come home to discover the "secret hum" of buzz pollination — the irreplaceable trick bumblebees use to pollinate your tomatoes, peppers, and blueberries that honey bees simply can't perform. Whether you've got acres or a single windowsill, this episode shows you how to run the Skerries experiment in your own backyard.

www.secretpollinators.com

KEY SOURCES

Skerries / large carder bee / Irish decline

• • The Irish Times, "Bees in big trouble as the lie of the land worsens," June 4, 2026. (Skerries pollinator corridor; large carder bee Bombus muscorum; ~3.5% annual decline since 2012; one-third of Irish wild bee species threatened; 2024 weather impacts; All-Ireland Pollinator Plan.)

Buzz pollination science

• • Audubon, "Tomatoes and Bumblebees" (jaw-grip posture; "middle C" frequency; four-fold tomato yield increase; western bumblebee Bombus occidentalis).
  • Apidologie (Springer), "Bumblebee sonication behavior changes with plant species and environmental conditions," 2016 (bees alter sonication frequency/duration; honey bees do not sonicate).
  • Journal of Economic Entomology (Oxford), "Buzz-Pollinated Crops: A Global Review and Meta-analysis," 2021 (~half of bee species sonicate; honey bees incapable; tomato/eggplant/kiwi/blueberry buzz-pollinated).
  • Ohioline (Ohio State University Extension), "Bumble Bee Pollination in Tomato Greenhouses," 2023 (mechanism of pollen release and transfer).
  • UConn, "Constructing Bee Habitats for Crops Benefiting Buzz Pollinators" (poricidal anthers; ~8% of flowering plants; crop families).
  • Biocommunication Group, "Buzz-pollination – Or why we need bumblebees in greenhouses," 2023 (crop list: tomatoes, potatoes, blueberries, bell peppers, cranberries, eggplants).

#SecretPollinators #BumbleBees #BuzzPollination #NativeBees #PollinatorMonth #LargeCarderBee #SaveTheBees #PollinatorGarden #BalconyGarden #ContainerGardening #GrowYourOwn #Tomatoes #WildflowerMeadow #PollinatorCorridor #CitizenScience #BumbleBeeAtlas #LetItGrowWild #GardenTok #NativePlants #Sonication #Ireland #IrishBees #Skerries #Dublin #Irish #Flowers #Carderbees #Gingerbee #Wildbees #BuzzPollination

Go out to a meadow at dusk and look closely at the flowers — some of them are occupied. Wild bees sleep out in the open, and once you know to look, you'll never stop seeing them. In this episode, Kelly opens up the secret nighttime life of native bees: why the females go home to their burrows while the males sleep outside in the flowers, the astonishing way a sleeping bee holds on (with its jaws), the loyal little crowds of males that bed down on the same stems night after night, and how a cold morning can leave a bumblebee frozen in place, waiting for the sun. Best of all, this is one wonder you can confirm with your own eyes tonight. No lab required. Just a flower and the right hour.

www.secretpollinators.com

KEY SOURCES

Male roosting behavior & sleeping aggregations (North American)

• • Harms, K.E. & Owens, B. — Multi-year fidelity to a backyard sleeping roost site by long-horned bee males (Melissodes), Baton Rouge, Louisiana. Journal of the Kansas Entomological Society (2025). Documents the same males returning to the same iris-patch roost across the 2017 and 2018 seasons, clustering more tightly than chance.
  • Alcock, J. — Sleeping aggregations of the bee Idiomelissodes duplocincta and their possible function (southwestern US, Anthophorini). Journal of the Kansas Entomological Society (1998).

Desert activity timing & body temperature (North American)

• • Roberts, S.P. et al. — A desert bee thermoregulates with an abdominal convector during flight (Sonoran Desert digger bee, Centris caesalpiniae, Scottsdale AZ). Journal of Experimental Biology (2022). DOI: 10.1242/jeb.244147. Males gather at female aggregations from sunrise and cease flight near midday at peak heat — ties day/night activity to temperature.

Male roosting behavior (international context)

• • Aguiar, A.J.C. & Martins, C.F. — Flowers as sleeping places for male bees (Tapinotaspidini). Arthropod-Plant Interactions (2017). DOI: 10.1007/s11829-017-9532-6
  • Mahlmann, T., Hipólito, J. & de Oliveira, F.F. — Male sleeping aggregation of multiple long-horned bee genera, Bahia, Brazil. Biodiversity Data Journal (2014). DOI: 10.3897/BDJ.2.e1556
  • Wcislo, W.T. — A male sleeping roost of a sweat bee (Augochlorella neglecta) in Panamá. Journal of the Kansas Entomological Society (2003).

What sleep looks like in bees / rest state

• • Kaiser, W. — early descriptions of bee rest posture (drooped antennae, reduced muscle tone, raised arousal threshold). Foundational sleep-behavior literature.
  • Eban-Rothschild, A. & Bloch, G. — sleep and circadian rhythms in bees (background context).

Torpor & temperature

• • Heinrich, B. — Bumblebee Economics and related thermoregulation work: bumble bees as ectotherms requiring warm-up before flight; torpor at low temperatures.

#SecretPollinators #NativeBees #WildBees #PollinatorPodcast #BumbleBees #SolitaryBees #LongHornedBees #PollinatorGarden #NatureAtDusk #BeeBehavior #SciencePodcast #PollinatorsMatter #BackyardNature #WatchTheBees

For 40 million years, a small group of bees has been pulling off one of the most elegant heists in the insect world. They build no nests. They raise no workers. They never collect a single grain of pollen. Instead, they walk into the colonies of other bumblebee species and quietly take them over. They are the cuckoo bumblebees — and in this episode of Secret Pollinators, we meet all six species living across the United States.

From the Suckley cuckoo bumblebee (Bombus suckleyi) of the Mountain West to the lemon cuckoo bumblebee (Bombus citrinus) of the eastern deciduous forests, this episode tours every cuckoo bumblebee in North America: Bombus suckleyi, Bombus insularis, Bombus flavidus, Bombus bohemicus, Bombus citrinus, and the vanishing Bombus variabilis.

We explore the chemistry of infiltration — how cuticular hydrocarbons let a cuckoo bumblebee queen smell her way into a host colony undetected. We unpack the violent takeover: the queen-on-queen combat, the reinforced exoskeletons and oversized stingers, and the pheromonal reproductive suppression that follows. And we end with the story of the variable cuckoo bumblebee, a southern species that may already be functionally extinct across much of its former American range — a ghost that lived by erasing other bees, and has now been erased itself.

A wonder-first science podcast about native bees, wild bees, bumblebees, and lesser-known pollinators.

www.secretpollinators.com

KEY SOURCES & DOIs

(Verify all DOIs and current citations before publication — these are starting points, not final.)

Cuckoo bumblebee biology, evolution, and ecology

• • Lhomme, P. & Hines, H. M. (2019). Ecology and evolution of cuckoo bumble bees. Annals of the Entomological Society of America, 112(3), 122–140. — the recent definitive review of the group; cite heavily for chemistry, weapons, and host-suppression material.

Cuticular hydrocarbon mimicry in social parasites

• • Foundational work by Lockey on cuticular hydrocarbons; more recent work by Dronnet, Lhomme, and colleagues on cuckoo-specific chemical mimicry. (Search: "cuticular hydrocarbons Psithyrus" or "cuckoo bumblebee chemical mimicry.")

North American bumblebee decline (including B. variabilis and host species)

• • Cameron, S. A., Lozier, J. D., Strange, J. P., Koch, J. B., Cordes, N., Solter, L. F., & Griswold, T. L. (2011). Patterns of widespread decline in North American bumble bees. PNAS, 108(2), 662–667.
  • Follow-up work by Cameron and colleagues on B. pensylvanicus and associated cuckoo species.

Conservation status of individual species

• • IUCN Red List entries for Bombus suckleyi, Bombus bohemicus, Bombus variabilis.
  • COSEWIC reports (Canadian) for B. bohemicus and B. suckleyi.

#CuckooBumblebee #CuckooBee #BeeHeist #BeeTheft #SecretPollinators #NativeBees #WildBees #Bumblebees #Bombus #ParasiticBees #BroodParasite #BombusSuckleyi #BombusCitrinus #BombusVariabilis #AmericanBumblebee #BeeScience #PollinatorPodcast #InsectScience #NatureScience #BeeFacts #PollinatorConservation #SocialParasite #CuticularHydrocarbons #BeeBiology #SciencePodcast #IndiePodcast #Bees

The US olive oil market is worth nearly three billion dollars — and 95 percent of it is imported. But across seven American states, a small, quality-focused domestic industry is growing. And native bees, without invitation or management, are showing up in those groves every spring and doing something that a landmark 2013 study in Science confirmed: improving crop fruit set in ways that honey bees alone cannot match.

Episode 41 follows olive trees from California's Central Valley to Georgia's coastal plain, and the native bee communities — mining bees, sweat bees, carpenter bees — that found them.

Secret Pollinators is a solo narration science podcast about native and wild bees and the lesser-known pollinators shaping the world around us.

www.secretpollinators.com

Key Sources & DOIs

The Anchor Study

• • Garibaldi, L.A., et al. (2013). Wild Pollinators Enhance Fruit Set of Crops Regardless of Honey Bee Abundance. Science, 339(6127), 1608–1611. https://doi.org/10.1126/science.1230200

Olive Pollination Biology

• • Giovanetti, M. (2018). Do bees like olive? A preliminary analysis of honey bee behaviour on flowers of the wind-pollinated species Olea europaea. Acta Horticulturae, 1199, 121–126. https://doi.org/10.17660/ActaHortic.2018.1199.20

US Olive Industry

• • American Olive Oil Producers Association: ~40,000 acres across CA, AZ, TX, GA, FL, OR, HI. https://www.aoopa.org/olive-oil-101
  • US olive oil market valued at ~$3B in 2024, projected ~$6B by 2033 (Renub Research / IMARC Group, 2024)
  • Georgia Olive Farms: first commercial harvest east of the Mississippi, 2011. https://georgiaolivefarms.com/gof/about-us/

Georgia Native Bee Research

• • Schlueter, M.A. & Stewart, N.G. (2015). Native Bee Abundance and Diversity in North Georgia Apple Orchards. Southeastern Naturalist, 14(4), 721–739.

#SecretPollinators #NativeBees #OliveOil #AmericanOliveOil #WildBees #Pollinators #MiningBees #SweatBees #CarpenterBee #OliveGrove #ExtraVirginOliveOil #BeePodcast #NaturePodcast #SciencePodcast #Pollination #BeeScience #GeorgiaOlives #CaliforniaOliveOil #GroveToTable #FoodScience #WildBees

A brand-new study — published this week in the Journal of Animal Ecology — just revealed something remarkable about bumble bee colonies: they function as living thermostats, maintaining their brood at a precise 30 to 33 degrees Celsius, which is 86 to 91 degrees Fahrenheit, using only the bodies of their workers. When temperatures drop, bees vibrate their flight muscles to heat the nest. When it gets too hot, they fan their wings — a living air conditioning system. And when heat events become extreme, the entire colony redirects its labor away from foraging to cooling, with cascading effects on pollination. Kelly breaks down the science of bumble bee thermoregulation, the critical role of underground nest sites, and what this research means for how we think about wild bumble bee habitat. It's not just about flowers. It's about what's happening below the surface.

www.secretpollinators.com

KEY SOURCES & DOIs

Primary Research — Published May 6, 2026

• • Mullan, F.R., Green, N.S., Youngsteadt, E., McCluney, K.E., & Penick, C.A. (2026). Nesting biology shapes climate vulnerability of social bees (Bombus spp.). Journal of Animal Ecology. DOI: 10.1111/1365-2656.70267
  • NC State University press release: https://news.ncsu.edu/2026/05/higher-temperatures-bumble-bees/

Bumble Bee Colony Thermoregulation Background

• • Bretzlaff, T., Kerr, J.T., & Darveau, C.A. (2024). Handling heatwaves: balancing thermoregulation, foraging and bumblebee colony success. Conservation Physiology, 12(1). DOI: 10.1093/conphys/coae006
  • Nest brood temperature range (30–33°C): well-established in the bumble bee thermoregulation literature; see Goulson (2010), Bumblebees: Behaviour, Ecology and Conservation

Nesting Habitat & Wild Bee Conservation

• • Biorxiv preprint (Sept. 2025): Nesting behaviour predicts heat tolerance evolution and climate vulnerability in bees. DOI: 10.1101/2025.09.02.673611

#BumbleBees #BumbleBeeSciece #BeeScience #NativeBees #WildBees #Pollinators #PollinatorScience #BeeNesting #GroundNestingBees #BeeHabitat #Superorganism #ColonyBehavior #InsectThermoregulation #BeeConservation #NativeBeeHabitat #BombusImpatiens #SecretPollinators #NaturePodcast #SciencePodcast #WildlifeScience #NatureLovers #EntomologyNerd #Entomology #BeeResearch #NewResearch #JournalOfAnimalEcology #AuburnUniversity #NCState #PollinatorProtection #SaveTheBees #BackyardBees #BeeNerd #InsectScience #MindBlown #ScienceIsAmazing #LivingThermostat #UndergroundBees