Buzz

Tomato, potato, eggplant, blueberry, cranberry, kiwifruit — somewhere between 15,000 and 20,000 flowering plant species keep their pollen sealed inside a tube-shaped anther, reachable only through a small pore at the tip. A visiting insect can't just brush against these flowers and pick pollen up the ordinary way. Most can't get it at all. The ones that can are called sonicating bees, and what they do to get it is stranger than brushing: they buzz.

A sonicating bee lands, curls around the anther cone, and grips its base with her mandibles. Then she does something a flying bee never does — she decouples her own wings from her flight muscles and fires those muscles anyway, bare, with nothing to beat. The vibration has nowhere else to go: it runs through her mandibles and body straight into the anther, the anther rings like a struck bell, and pollen grains — gaining real kinetic energy from the shaking, not just falling loose — get thrown out through the pore. Grab the anther cone below, or send a bee at it.

The frequency isn't the trick, or not the one you'd guess. A bee's fundamental buzz sits somewhere between 100 and 400 Hz depending on the species — set by how fast her thoracic flight muscles can contract, a rate insect muscle physically caps around 500 contractions a second — and pop-science retellings love to frame that as a lock a bee has to pick. The actual controlled experiments say otherwise: varying the frequency of an artificial buzz had a negligible effect on how much pollen came out. Duration and amplitude did the work. A typical bout runs 1 to 17 pulses, and the first two usually clear up to 60% of the available pollen on their own — every pulse after that returns less than 10%, a bee visibly working harder for a shrinking reward.

None of that resets when you send the next bee. This is one flower, and it keeps whatever pollen the last visitor left it until you click “New flower.” Send five bumblebees in a row and the fifth works exactly as hard as the first — same pulse range, same effort — for a shrinking pile of actual pollen, because there's a shrinking pile left to find. Watch the anther itself pale as it empties.

So a honeybee sitting on this same flower, at this same moment, is not failing a pitch test. She can vibrate fast enough — honeybees buzz for plenty of other reasons, warming the nest, compacting sand, signaling alarm, all well within range. She simply never grabs the anther and fires her flight muscles into it. Apis mellifera is one of the few well-studied pollen-collecting bees that, watched closely with an accelerometer against a poricidal anther, appears not to sonicate at all — and nobody has a full answer for why. What's known about the bees that do buzz points the same direction as most of this site's own honest gaps: it's not one clean switch. Naive bumblebees buzz correctly on their very first foraging trip, which looks innate — and then keep getting measurably better at it over days of repeated visits, which looks learned. Both are true at once.

Honest gap: the per-pulse release curve this room animates (60% cleared by pulse two, under 10% each pulse after) is this room's own illustrative model of that qualitative pattern, not a plotted dataset — the pulse count (1–17) and fundamental frequency (100–400 Hz) drawn for each bee are uniform draws across the review's own cited ranges, not a measured distribution. The papers measured that curve within one bee's own bout, pulse by pulse; carrying the same shrinking-fraction logic across separate bees sharing one flower, so a later bee finds less to take, is this room's own modeled extension of that finding, not a claim either cited paper makes about repeat visits — though it's the plain arithmetic consequence of a shared, finite pollen store. The honeybee's silence here is deterministic for clarity; the review names Apis mellifera specifically as the well-documented case, alongside stingless bees in the genus Trigona, not as the only two bees that never sonicate. No date, no rng() from plant.js — only Math.random(), the same undated toy-randomness /pod and /weeds already use for a mechanism that draws on a visitor's own click, not a date.

Sources: De Luca, P.A. & Vallejo-Marín, M., What's the 'buzz' about? The ecology and evolutionary significance of buzz-pollination, Current Opinion in Plant Biology 16(4), 429–435 (2013), doi:10.1016/j.pbi.2013.05.002. King, M.J. & Buchmann, S.L., Floral sonication by bees: mesosomal vibration by Bombus and Xylocopa, but not Apis (Hymenoptera: Apidae), ejects pollen from poricidal anthers, Journal of the Kansas Entomological Society 76, 295–305 (2003).