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// Biology 
// Story: Lyra Heartstrings Guide to Human Culture and Biology 
// by Serperior2 
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Humans are geovores and herbivores their diets are composed largely of minerals, metals, gems, vegetables and fruits. They can eat almost anything without so much as indigestion. Some foods however are an exception, such as Brussels sprouts, which contain some unknown chemical aversion, and potatoes for a similar unknown reason (CalorieFree). They were expert farmers and originally devised crop rotation long before ponies. Humans have three stomachs each with the ability to digest certain materials. One stomach is for metals, another for organic foods, and a third for rocks and gems (BioChem).

The fact that they are geovores is derived from their extreme similarities to diamond dogs in spinal structure, brain size, overall stature, and hands. There is supporting evidence that diamond dogs and humans share a common ancestor due to these homologous structures.(CalorieFree)

Humans have roughly 415 bones in the male human body, most of which are in their hands, feet, knees, elbows, and testicles. The structure surrounding the testes is made up of approximately one hundred small plates similar to scales, but made of the same material as bone as well as being endoskeletal. (BioChem) These are likely meant to protect the sack due to their vulnerable position on the chin. Females only have 300 bones, which are also focused in the hands, feet, and joints. The majority of a humans skeleton is endoskeletal but the entirety of the fingers have a solid chitin like cover referred to as a "nail" that is considered to be an exoskeleton by most. These nails can be used for gripping objects, cutting through or ripping soft objects like leaves, or making a punch more effective when fighting off predators. 

The human nose is not extremely effective like that of a pony of dog. They have far fewer nerves for sensing scents than most other animals and thus are not as effective at locating things through that sense. Their ears are also far less effective for similar reasons, including the size and placement of the outer ear. They make up for this with their incredible sense of sight and touch. While ponies and most other animals can only see the normal colors of the rainbow humans can see ultraviolet and infrared light, allowing for a larger spectrum for them to see. They also have extremely sensitive fingers for feeling things, the fingers on one of their hands contains about as many nerves as the entire pony body, despite the hard coverings over them. 

Humans are bipedal. Most bipedal creatures are much slower than quadrupeds. Humans however, are the exception. They can run at an astounding forty miles per hour on average, and with proper training similar to a professional hoof racer they can achieve sixty miles per hour. These speed machines can almost keep up with cheetahs from Zebrica, and far outrun numerous other predators. 

Humans are incapable of properly harnessing magic similar to zebras or unicorns. Their magic flows naturally through the body aiding them subconsciously like with earth ponies and pegasi. Their magic adds to their speed, and overall strength. The magic also aids the digestive process in the same way it does a diamond dog. 

Humans are truly a majestic creature with a magnificently unique anatomy, they are the outliers of nature, and when considering their amazing abilities it becomes even more a mystery when considering the cause of their tragic disappearance.