The common emigrant was named from its habit of migration. It is medium sized pierid butterfly found in Asia, Cambodia and some parts of Australia. The species has pale and dark morphs in Australia. The form crocale has the antennae black and the form Pomona has the antennae pinkish or red. The development of these forms has been linked to photoperiod and temperature during growth. The eggs of the butterfly are laid on various species of plant including several Cassias.

The Common Emigrant (Catopsilia pomona) is a medium to large butterfly, known for its pale yellow or greenish-yellow wings, which often mimic the look of leaves, providing excellent camouflage. The upper side of the wings is typically pale yellow or white, with faint markings, while the underside is mottled with shades of green, brown, or yellow, resembling dry leaves. Some individuals may have small, dark spots on the forewings.

The wings are broad and rounded, with a wingspan of about 50-70 mm. The forewings are somewhat pointed, and the hindwings have a smooth, rounded edge. The body of the butterfly is slim and pale, and the antennae are slender and dark.

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