Other than their unique domed body forms, they live and behave like any other caterpillar! 

Red-crossed Button Slug
Tortricidia pallida

dorsal view

lateral view

Spiny Oak Slug

Euclea delphinii

Yellow-shouldered Slug

Lithacodes sp.

Red-crossed Buttonn Slug

Tortricidia pallida

Crowned Slug

Isa textula

Elegant Tailed Slug

Packardia elegans