I found myself out at the park under a full moon a few nights ago, and I noticed three things at once. Barely any mosquitoes — for a July night in Minnesota, that's practically unheard of. Nowhere near as many fireflies as I remember from being a kid. And strangest of all, the crickets seemed to be chirping in near-perfect unison, like they'd rehearsed it.
I wasn't sure if I was imagining any of it, or just getting nostalgic. So I asked. Turns out all three are real, documented, and each one is telling a completely different story.
Not your imagination — this one's actually tracked. The Metropolitan Mosquito Control District has reported Twin Cities mosquito numbers running below the ten-year average for roughly a decade now, mostly driven by recurring dry spells. 2026 has been called a "boring" mosquito year, with trap counts running well below normal because a low snowpack and dry spring meant floodwater mosquito eggs never got the rain trigger they need to hatch. It's not necessarily permanent — a wet year like 2024 lets certain species bounce right back — but the broader pattern is real.
This one's sadder, and more permanent. Firefly populations are declining across North America — roughly one in three species is considered at risk — because of habitat loss, pesticide use, and especially light pollution, which disrupts the flash patterns males use to find mates. Researchers note the decline is sharpest exactly where "lawns, streetlights, and mosquito spray converge," which is a fair description of most established suburban neighborhoods, including mine. Firefly larvae also spend one to two years developing in leaf litter and rotting wood, so a tidy lawn quietly starves out next year's fireflies before they ever get a chance to light up.
This is my favorite of the three, because it's genuinely elegant. What I was hearing is called entrainment — the same mathematical phenomenon that explains why fireflies flash in unison and why pendulum clocks on the same wall gradually fall into sync. Each male cricket has his own natural rhythm, but within earshot of other males, tiny timing adjustments pull them into a shared pulse.
Three things noticed in one twenty-minute lie-down in the grass, and three completely different explanations: one is weather, temporary and forgettable by next wet summer. One is a real and largely permanent environmental loss happening quietly in our own backyards. And one is just beautiful, indifferent physics, playing out at midnight whether anyone's listening or not.