Phenology
The timing of seasonal life events in organisms—like when plants flower, insects emerge, or birds migrate—often shifting with climate changes.
The study of the timing of recurring biological events in organisms and ecosystems, such as flowering, migration, hibernation, and breeding. Phenology tracks how these seasonal events respond to environmental cues like temperature and daylight, and how shifts in timing can cascade through food webs and ecosystems.
What this means in real life
If spring arrives two weeks earlier than usual, wildflowers bloom sooner, but the caterpillars that feed on them may not hatch until their normal time—leaving newly emerged butterflies without food.
What it isn’t
It is not the study of physical traits or inherited characteristics (that's genetics). Phenology focuses on *when* events happen in an organism's life cycle, not *what* the organism looks like or how traits pass between generations.
Commonly misused online
Often conflated with 'phenotype' (an organism's visible traits). Social media sometimes uses 'phenology' loosely to mean any seasonal change, when it specifically refers to the *timing* of biological events.
Based on 1 reference source, including primary sources. Last verified July 16, 2026.