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Alfalfa leafcutting bees are way better at pollinating alfalfa flowers than honeybees. They don’t mind getting thwacked in the face by the spring-loaded blooms. And that's good, because hungry cows depend on their hard work to make milk. Join our community on Patreon! / deeplook Take the PBS Survey (2023 edition): https://to.pbs.org/pbssurvey2023g DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small. --- Sure, cows are important. But next time you eat ice cream, thank a bee. Every summer, alfalfa leafcutting bees pollinate alfalfa in an intricate process that gets them thwacked by the flowers when they release the pollen that allows the plants to make seeds. The bees’ hard work came to fruition last week when growers in California finished harvesting the alfalfa seeds that will be grown to make nutritious hay for dairy cows. This is how it works. To produce alfalfa seeds, farmers let their plants grow until they bloom. They need help pollinating the tiny purple flowers, so that the female and male parts of the flower can come together and produce fertile seeds. That’s where the grayish, easygoing alfalfa leafcutting bees come in. Seed growers in California release the bees – known simply as cutters – in June and they work hard for a month. Alfalfa’s flowers keep their reproductive organs hidden away inside a boat-shaped bottom petal called the keel petal, which is held closed by a thin membrane that creates a spring mechanism. Cutter bees come up to the flower looking for nectar and pollen to feed on. When they land on the flower, the membrane holding the keel petal breaks and the long reproductive structure pops right up and smacks the upper petal or the bee, releasing its yellow pollen. This process is called “tripping the flower.” When the flower is tripped, pollen falls on its female reproductive organ and fertilizes it; bees also carry pollen away on their hairy bodies and help fertilize other flowers. In a few weeks, each flower turns into a curly pod with seven to 10 seeds growing inside. Cutters trip 80 percent of flowers they visit, compared to honeybees, which only trip about 10 percent. --- --- What kind of a plant is alfalfa? Alfalfa is a legume, like beans and chickpeas. Other legumes also hold their reproductive organs within a keel petal. --- What do bees use leaves for? Alfalfa leafcutting bees and other leafcutter bees cut leaf and petal pieces to build their nest inside a hole, such as a nook and cranny in a log. Alfalfa farmers provide bees with holes in styrofoam boards. ---+ Read the entire article on KQED Science: https://www.kqed.org/science/1946996/... ---+ Shoutout! 🏆Congratulations 🏆to the following fans for correctly identifying the bee body part coated in pollen, on our Leafcutting Bee - the scopa or scopae! Punkonthego GamingCuzWhyNot Galatians 4:16 Gil AGA Edison Lewis ---+ Thank you to our Top Patreon Supporters ($10+ per month)! Leonhardt Wille Justin Bull Bill Cass Sarah Khalida Mohamad Daniel Weinstein Chris B Emrick Karen Reynolds Tea Torvinen David Deshpande Daisuke Goto Companion Cube WhatzGames Richard Shalumov Elizabeth Ann Ditz Gerardo Alfaro Robert Amling Shirley Washburn Robert Warner Supernovabetty johanna reis Kendall Rasmussen Pamela Parker Sayantan Dasgupta Joshua Murallon Robertson Cindy McGill Kenia Villegas Shelley Pearson Cranshaw Aurora Dean Skoglund Silvan Wendland Ivan Alexander monoirre Sonia Tanlimco Two Box Fish Jane Orbuch Allen Laurel Przybylski Johnnyonnyful Rick Wong Levi Cai Titania Juang Nathan Wright Carl Michael Mieczkowski Kyle Fisher JanetFromAnotherPlanet Kallie Moore SueEllen McCann Geidi Rodriguez Louis O'Neill Edwin Rivas Jeanne Sommer Katherine Schick Aurora Mitchell Cory Ricardo Martinez riceeater Daisy Trevino KW PM Daeley Joao Ascensao Chris Murphy Nicolette Ray TierZoo ---+ Follow KQED Science and Deep Look: Patreon: / deeplook Instagram: / kqedscience Twitter: / kqedscience KQED Science on kqed.org: http://www.kqed.org/science Facebook Watch: / deeplookpbs ---+ About KQED KQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, radio and web media. Funding for Deep Look is provided in part by PBS Digital Studios. Deep Look is a project of KQED Science, which is also supported by the National Science Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Fuhs Family Foundation, Campaign 21 and the members of KQED. #leafcutter #bees #deeplook