Tamil Nadu witnessed reasonably good migration of butterflies from the Western Ghats hill ranges to the plains and the Eastern Ghats in April and May this year.
It was followed by good pre-monsoon rainfall across the State in the summer.
As per the observations made by TNBS since 2013, no butterfly migration was reported in 2016 when Tamil Nadu witnessed a drought-like situation.
Though the migration improved in 2017 and 2018, there was a decline in 2019.
The Nature and Butterfly Society (TNBS) considers this year’s migration ahead of Southwest Monsoon a healthier one compared to the ones in the past few years.