Anyone who knows how a skeleton looks like knows that there are spaces between the ribs. However, why does it have gaps between them? Why isn’t it a single shell?
Anyone who knows how a skeleton looks like knows that there are spaces between the ribs. However, why does it have gaps between them? Why isn’t it a single shell?
Having a shell like protection wasn’t that necessary in most cases. Turtles needed the protection, but mammals were capable of getting away without it.
Shells are also heavy. If an deer had a shell, it wouldn’t be as fast. Also, the shell wouldn’t really help agains wolves, so that protection would come with a lot of downsides. I guess the only real benefit would be when humans are trying to stab the chest or sides of the deer with spears and arrows.