Environment News

Butterfly Migration in Western Tamil Nadu

October 20 , 2026 15 hrs 0 min 60 0

Large-scale butterfly migration was observed across Salem, Namakkal, Erode, Tiruppur and Coimbatore districts after the onset of the Northeast monsoon.
Blue Tiger, Dark Blue Tiger, Common Crow and Double-branded Crow butterflies were seen moving west and southwest toward the Western Ghats foothills.
Blue Tigers crossed Rasipuram at 72 individuals per minute, while movement in Coimbatore reached 135 butterflies per minute.
The The Nature and Butterfly Society (TNBS) has monitored this migration pattern since 2013.
A reverse movement from the Western Ghats towards the Eastern Ghats and plains normally occurs during April–May.