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Two-tailed Swallowtail

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description Two-tailed Swallowtail Overview

The Two-tailed Swallowtail (Papilio multicaudata) is a large butterfly native to western North America, ranging from British Columbia to Central America. Its defining feature is the presence of two tail-like extensions on each hindwing, which are believed to distract predators from attacking the butterfly's body. The wings display a yellow background with black striping and blue and orange spots near the tails, creating a distinctive pattern visible in flight. Designated as the state butterfly of Arizona, the Two-tailed Swallowtail frequents riparian habitats and can be observed from May to September, depending on local climate conditions.

help Two-tailed Swallowtail FAQ

What is the wingspan of the Two-tailed Swallowtail butterfly?

The Two-tailed Swallowtail (Papilio multicaudata) is one of the largest butterflies in North America, with a wingspan ranging from approximately 3.5 to over 5 inches. Females tend to be larger than males, and individuals in the southwestern United States can reach the upper end of this range.

Where does the Two-tailed Swallowtail live?

Papilio multicaudata ranges across western North America from British Columbia in Canada down through the western United States and into Mexico and Central America. It is commonly found along streams and in canyons, woodlands, and gardens where its host plants—primarily trees in the ash family and hop trees—are present.

How does the Two-tailed Swallowtail differ from the Western Tiger Swallowtail?

While both species share yellow wings with black tiger stripes, the Two-tailed Swallowtail has two distinct tail-like extensions on each hindwing rather than one, and it is generally larger. The Western Tiger Swallowtail (Papilio rutulus) is more uniformly yellow with broader black bands, and the two species can overlap in range across the western United States.

What purpose do the two tails on the hindwing serve?

The tail-like extensions on each hindwing are believed to function as a predator defense by creating a false head illusion, drawing attacks from birds and other predators toward the wing margins rather than the butterfly's actual body. When a predator grabs a tail, the swallowtail can often escape with only minor wing damage.

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