Yes, swans are vertebrates and all vertebrates have back bones.
No there is more with backbones
it has 2 backbones
No backbones
Pigs do have backbones.
All snakes have backbones.
swans hisses
The backbones are part of the skeleton.
all fishes have backbones
no they don't have backbones
No cicadas do not have backbones, they are invertebrates. Any Animal and insects that is an invertebrates do not have backbones.
no myriapods don't have backbones