What are the predators of a swallowtail butterfly?
Some swallowtails are toxic so predators avoid them but for most swallowtails, predators include birds, spiders, dragonflies and robber flies.
Amphibians such as lizards, birds, and spiders are three main predators of the swallowtail butterfly [Papilionidae family]. A fourth main predator may be humans. Humans become butterfly predators in three main ways. They're predatory as children before realizing that butterflies aren't playthings or toys. They're predatory as collectors. They're predatory as developers, home gardeners and landscapers before realizing the importance of natural habitat protection.
It depends upon which blue swallowtail butterfly. There are several species of blue swallowtails including (in the US) the female Eastern Black Swallowtail, female Tiger Swallowtail has blue, female Spicebush Swallowtail ... and more. Their wing span can range from 3 inches to nearly 5 inches, depending upon the species, health of the butterfly when it was a caterpillar, food availability, and time of year.
A Tiger Swallowtail is a butterfly that has distinctive yellow and black striped markings on its wings and body. It has the wing span of 3.5-6.5 inches. The tiger swallowtail is called by it's name swallowtail because they have long "tails" on their hind wings which look like the long, pointed tail of swallows.