Yes, they do.
Collective nouns for hares are a drove of hares, a down of hares, a husk of hares, a mute of hares, a leash of hares, and a trace of hares.
There are several collective nouns for hares, they are listed below; drove of hares, down of hares, husk of hares, leash of hares, trace of hares, trip of hares, warren of hares
No there is more with backbones
Pigs do have backbones.
No backbones
it has 2 backbones
All snakes have backbones.
all fishes have backbones
The backbones are part of the skeleton.
no they don't have backbones
no myriapods don't have backbones
All dinosaurs had backbones.