common grass yellow butterflies or eurema hecabe is sapping on salt and mineral which also call mud puddling phenomenon during

yellow butterfly puddling mineral wildlife nutrient salt kaeng krachan abundance adult animal asia beautiful bug colorful common cycle decay dirt entomology environment eurema feed flock food forest grass hecabe insect male mating moist mud national nature nutrition organics park phenomenon rainforest reserve rich rotten sap season soil summer swarm thailand tropical