The big thing about skeletals that makes them stand out is how bony they are. With parts of their bodies missing they have bones sticking out all over the place.
These guys are really at the end of their run as zombies. They are super freaky to look at and pose a little less harm than some other zombies might. Don’t let that lull you into a false sense of security though. These things are still zombies after all and they’re still dangerous. They’re just going to move a lot slower than other zombies.
One of the dangers they pose is that, being smaller and lighter, it’s a bit easier for them to be hidden where you wouldn’t expect. They could get into crawl spaces, under beds, small areas where you might not think they would be lurking. *Compare these to crawlers as they have a number of similarities.