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TREE: A medium sized tree with dark gray, often nearly black, fisured bark.
If you check the leaves of many ash trees along the watered canyons of the Sonoran Desert you may eventually find a caterpillar that resembles a bird dropping. One of several that take this disguise, the caterpillar belongs to the Two-tailed Swallowtail, Papilio multicaudata. The butterflies are a common site in watered canyons where they patrol up and down canyon. A resting caterpillar is shown on the lowest leaf in the illustration at left.
Oleaceae -- Olive Family
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