Floating heads

After Minecraft is loading I see that my Minecraft skin doesn't have a body any more. So i checked to see if it was just my skin or if it was like that for all the other skins as well. When I saw that all the Minecraft skins didn't have a body I decided to make a hypothesis base on what I saw. My hypothesis was that if all the Minecraft skins didn't have a body then all the Minecraft mobs and animals wouldn't jave a body either. I was figbt all the Minecraft mobs, animals, and skins didn't have a body. And when i put diamond armor on my Minecraft skin on the helmet showed. It does it to all the armor and even the armor stands only have a head no body.