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The four larger whitish butterflies are mottled emigrants. While the smaller yellowish ones at the right and left are Three-Spot Grass Yellow (Eurema blanda)
this type of butterfly congregations are quite common. It is called MUD PUDDLING. The behavior is common among the males of the butterfly species and it is done in order to obtain salts, minerals and amino acids from the soil necessary for their metabolism. this one was on the banks of a stream among forest area.