The tailed jay is a predominantly green and black tropical butterfly which belongs to the swallowtail family. The butterfly is also called as the green-spotted triangle, tailed green jay green triangle. It is found in Nepal, India, Sri Lanka. This species was first described by Carl Linnaeus in his 1758 10^th edition of Systema Naturae. The tailed jay butterflies are strong and restless fliers. They are active butterflies who flutter their wings constantly even when at flowers. They are active throughout the year but their abundance depends upon the local monsoon and availability of the larval host plant.

The Tailed Jay (Graphium agamemnon) is a striking, fast-flying butterfly known for its vibrant green and black pattern. It has a wingspan of about 85-100 mm, making it a medium to large butterfly. The upper side of the wings is black, adorned with bright green spots and streaks that form an irregular, vivid pattern. The most distinctive feature of this butterfly is the elongated tail-like projection on each hindwing, giving it the "tailed" name.