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Butterfly Migration in Tamil Nadu 2023
November 29 , 2023
355 days
745
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- Butterfly migration from the Eastern Ghats and plains towards the Western Ghats, an annual phenomenon coinciding with the onset of the Northeast monsoon, was below par this year.
- Large scale movement of butterflies towards the west not recorded till date since September, possibly due to below normal rainfall in west zone districts.
- Before the onset of the Northeast monsoon, butterflies from the subfamily Danainae, such as Blue Tiger, Dark Blue Tiger, Double-branded Crow, and Common Crow (commonly known as ‘Tigers and Crows’), leave these hills and fly towards the west.
- But observers saw only a low scale migration of Tigers and Crows since September this year.
- Tamil Nadu had a rainfall of 92% of its normal level (June-September 2023).
- While the districts involved in the migratory movement in the west zone, especially Salem and Namakkal, had a deficit of 7% and 10%.
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