Caterpillars

Photo by Gerald J. Lenhard, Lousiana State University, Saddleback Caterpillar

Photo by Oakley Originals,Polyphemus caterpillar

Photo by Joost J. Bakker, IJmuiden, Cinnabar Moth Caterpillar

Photo by Johnb2008, Pale Tussock Moth Caterpillar

Photo by DeadEyeArrow, Dryas Ulia

Photo by School of Ecology and Conservation Banalore, India, Great Orange Tip

Photo by wwarby, Unidentified

Photo by MommaGeek

Photo by bareego  Wattle Notodontid Moth Caterpillar

Photo by Sidpix   Monarch Caterpillar

One Billion Monarch Migration

Photo by Scott Clark

Photo by Raina Kumra
An estimated 60 million to 1 billion Monarch butterflies migrate annually from the Rocky Mountains to the Monarch Butterfly Biosphere Reserve located in Michoacan, Mexico.