No information can be found on which caterpillar is the smallest because they can vary in size so greatly. Most caterpillars are almost too small to see with the naked eye when they hatch, and they grow as the eat more.
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The smallest caterpillar species is believed to be the moth caterpillar of the Eupithecia pusillata, which can grow as small as 1mm in length.
The largest caterpillar in the world is the Hickory Horned Devil. This caterpillar can grow up to six inches in length.
A caterpillar is in the Larva stage. When it goes into it's cocoon it will be in the pupa stage. When it hatches, it will become a butterfly (and therefore be in the adult stage)
A caterpillar is a herbivore, meaning it primarily eats plant material such as leaves.
The Atlas moth caterpillar holds the record for the largest caterpillar, reaching lengths of about 4-5 inches. Its size allows it to grow into one of the world's largest moths with a wingspan of up to 10 inches.
The casing spun of silk by a caterpillar is called a cocoon. The caterpillar uses its silk glands to produce the silk thread and constructs the cocoon to protect itself during the pupal stage of its life cycle. The silk cocoon serves as a safe environment for the caterpillar to undergo metamorphosis and emerge as an adult moth or butterfly.
A caterpillar typically stays in its egg for about 1-2 weeks before hatching. The exact duration can vary depending on the species of caterpillar.