During mid- to late summer and early autumn, large, unusually shaped, colorful caterpillars are often seen. These caterpillars, larvae of moths and butterflies, feed on leaves of various trees, shrubs, and other plants. The exact host plant or plants vary with each species of caterpillar. Most giant caterpillars are discovered when wandering across lawns, driveways, sidewalks, etc. These caterpillars are fully grown and they are on their way to pupation (transformation into adults) sites. They have finished eating and will cause little or no further plant damage.
Jacot's Garden: Giant caterpillars - African Emperor Moth - Bunaea alcinoe.
Giant Silkworm Moth Caterpillar (Lonomia obliqua) - by Ferdy Christant - JungleDragon
Large Caterpillars of North America
Stinging Caterpillars
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Giant hawkmoth caterpillars found in Welsh garden - BBC Newsround
Dayton Insects
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Large Sphinx Caterpillar The Backyard Arthropod Project