Select the vertebrate.

 - bess beetle
 - Caribbean reef octopus
 - tiger
 - metallic tarantula
A tiger is a mammal. Like other mammals, a tiger is a vertebrate. It has a backbone.
A bess beetle is an insect. Like other insects, a bess beetle is an invertebrate. It does not have a backbone. It has an exoskeleton.
Like other octopuses, a Caribbean reef octopus is an invertebrate. It does not have a backbone. It has a soft body.
Like other tarantulas, a metallic tarantula is an invertebrate. It does not have a backbone. It has an exoskeleton.