Usage patterns
蝶が飛ぶa butterfly flies/flutters about
A butterfly is fluttering around the garden.
蝶を捕まえるto catch a butterfly
The child caught a butterfly with an insect net.
蝶が花の蜜を吸うa butterfly sips nectar from a flower
The butterfly is sipping nectar from the flower.
Expressions
蝶よ花よbringing up like a princess; doting on one's daughter
