Humidity‑driven color shifts in bees

A humidity change can swell the microscopic, non‑pigmentary structures that make some bees appear blue or green, producing a reversible color shift within a day. That means museum photos and field sightings can reflect recent weather rather than genetic color differences. — This implies that visual records used for species identification, climate proxies, and biodiversity monitoring may be confounded by short‑term weather effects, altering how scientists and policymakers use color as an ecological signal.