no they are not at least not that i found
flying squirrles dose have bones.
Yes as birds with hollow bones cannot fly for longer whereas penguins do not have hollow bones and are able to swim in rough tides for ages. Also non-hollow bones are stronger and tougher than hollow bones.
hollow bones
Birds have hollow bones to help them fly. Solid bones would add to much weight and make it impossible to fly.
Coral, jellyfish, and aneomes are hollow bodied animals
Raptors have strong bones for protection and their bones are hollow so that they are able to run fast
You will be asked this in health and the answer is Marrow.
hollow bonesfeathersmuscular chests
Ptarmigans, like many flying birds, have hollow bones. These light bones make it easier for the bird to fly. During the summer, the ptarmigans bones become heavier and stronger so they can withstand the stress of the ptarmigan's search for food. in the winter the bones become lighter so the bird can conserve energy while flying.
they have hollow bone and human bones are solid
A group of flying squirrels is called a "Dray".
The Flying Squirrels prey is mostly fungi.