Select the invertebrate.
birdwing butterfly dwarf crocodile rainbow trout yak
Hint: Insects, spiders, and worms are invertebrates.
Vertebrates and invertebrates are both groups of animals.
A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange.
An invertebrate does not have a backbone. In fact, invertebrates do not have any bones! Some invertebrates have an outer cover on their body called an exoskeleton. Other invertebrates have a soft body.
A yak is a mammal. Like other mammals, a yak is a vertebrate. It has a backbone.
A birdwing butterfly is an insect. Like other insects, a birdwing butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
A rainbow trout is a fish. Like other fish, a rainbow trout is a vertebrate. It has a backbone.
A dwarf crocodile is a reptile. Like other reptiles, a dwarf crocodile is a vertebrate. It has a backbone.