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It is the same with them: cloudless sulphur butterflies, swallowtails and hummingbirds.

Entomologist Chip Taylor began his career studying sulphur butterflies as a Ph.D. student at the University of Connecticut.

Bees hummed among the scabious, and blue and sulphur butterflies hovered over the patches of wild thyme.

Down the trail, a small orange sulphur butterfly darts between shrubs.

This might be a migration of sulphur butterflies, thousands flying steadily toward the southeast hour after hour, day after day.