Select the invertebrate.

 - comet moth
 - European green toad
 - sparrow
 - panda
A comet moth is an insect. Like other insects, a comet moth is an invertebrate. It does not have a backbone. It has an exoskeleton.
A sparrow is a bird. Like other birds, a sparrow is a vertebrate. It has a backbone.
A European green toad is an amphibian. Like other amphibians, a European green toad is a vertebrate. It has a backbone.
A panda is a mammal. Like other mammals, a panda is a vertebrate. It has a backbone.