I tricked you: all the other creatures in this quiz had a backbone, but I did not mention that for this creature. You need to be careful: we are studying vertebrates. If the creature does not have a backbone, the criteria for the classes of vertebrates do not apply. There are a lot of creatures that are not vertebrates, but share some vertebrate characteristics. Insects have wings and can fly like birds. Many creatures lay eggs, such as insects. Many have larval stages, like clams and insects.