Beside Creeping Wood Sorrel
The Pale Grass Blue is a butterfly that can be seen everywhere. This is because Creeping Wood Sorrel grow everywhere, and the Pale Grass Blue larvae feed on Creeping Wood Sorrel as they grow.
There are many species of the family Lycaenidae, but the plants that the larvae feed on are different from each other, so information about which plants they were seen near is important in identifying them.