They have an exoskeleton, which is their "backbone"
No cicadas do not have backbones, they are invertebrates. Any Animal and insects that is an invertebrates do not have backbones.
A chorus of cicadas.
No, cicadas are not carnivorous. Both the larvae (nymphs) and adults feed on plant sap.
No there is more with backbones
No the horrific bug that is a cicada is infact not poisonous
it has 2 backbones
No backbones
Pigs do have backbones.
All snakes have backbones.
There is no standard collective noun for cicadas. However, any noun that suits the context of the situation can function as a collective noun, for example, a chorus of cicadas, a clatter of cicadas, a din of cicadas, etc.
That depends on how much you care about the cicadas
Apparently, only male cicadas make sounds.