Context:
Kolkata has recently witnessed an unusual surge in brown butterflies, sparking curiosity and mild concern among residents. Experts confirm that this rise is a seasonal, climate-driven natural phenomenon, primarily influenced by prolonged monsoon rains and favourable ecological conditions. The species responsible for this sudden appearance is the Common Evening Brown (Melanitis leda).
Common Evening Brown (Melanitis leda)
- Species: Common Evening Brown (Melanitis leda) — small, leaf-like butterflies with wingspan around 2.5–3 inches.
- Weight: A few milligrams
- Appearance: Brown wings that mimic dry or dead leaves, helping them blend into forest floors and grassy patches.
- Behaviour: Active during dusk and night; often attracted to artificial lighting.
- Extent: Swarming balconies, homes, gardens, pavements and common urban open spaces.
