Priority Mail Dimensional Weight Calculation. 1Round off (e.g., 20.5 rounded off to the next whole number is 21, and 20.4 rounded off is 20), 2Round up (e.g., rounding up either 44.2 or 44.8 to the next whole pound is 45).
The Black Swallowtail (Papilio polyxenes) is a species of butterfly. It is also called the American Swallowtail or Parsnip Swallowtail. It is found throughout much of North America.
This family contains species that are the largest butterflies in North America. Swallowtails get their name from the tails on the back edge of their wings that reminded people of the forked tails of Swallows.ome more information... This family includes the largest butterfly species in Michigan, the Giant Swallowtail, Papilio cresphontes. It can have a wingspan of 15 cm. The largest butterflies in the world are in this family too, they are called birdwing butterflies and live in Australia and Southeast Asia.