Digestive system

Oesophagus:

The oesophagus is a muscular tube connecting the throat with the stomach. The oesophagus is about 8 inches long and is lined by moist pink tissue called mucosa. The oesophagus runs behind the windpipe and heart, and in front of the spine.
Based on the dimensions of a giraffe oesophagus, the researchers estimated that a full one can hold about 1.3 gallons. The oesophagus is about 9-10 inches (25 centimetres) long and less than an inch (2 centimetres) in diameter when relaxed. Food going down the oesophagus is like reverse pooping because of your pushing stuff in rather than out

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Stomach:

The stomach is a muscular organ located on the left side of the upper abdomen. The stomach receives food from the oesophagus. As food reaches the end of the oesophagus, it enters the stomach through a muscular valve called the lower oesophagal sphincter. The stomach secretes acid and enzymes that digest food. The stomach is the widest part of the digestive system. It not only digests food, but it also stores it. The stomach can hold a bit more than 1 litre of food at once. The design of the stomach allows a person to eat a large meal that can be digested slowly. Did you know that the platypus 

Large intestine:

The large intestine, also known as the large bowel, is the last part of the digestive system in vertebrates. Water is absorbed here and the remaining waste material is stored as faeces before being removed by defecation. Cows intestines are 20 times longer than its own body length, a blue whale's large intestine can be 220 which is only 7 to 8 times its body length

Liver:

The liver is a large, meaty organ that sits on the right side of the belly. ... The liver also detoxifies chemicals and metabolizes drugs. As it does so, the liver secretes bile that ends up back in the intestines. The liver also makes proteins important for blood clotting and other functions. The liver is high in vitamin A, folic acid, iron, and zinc. The liver is the most nutrient-dense organ meat, and it is a powerful source of vitamin A. Vitamin A is beneficial for eye health and for reducing diseases that cause inflammation, including everything from Alzheimer's disease to arthritis.

Small intestine:

The small intestine (small bowel) is about 20 feet long and about an inch in diameter. Its job is to absorb most of the nutrients from what we eat and drink. Velvety tissue lines the small intestine, which is divided into the duodenum, jejunum, and ileum. The cow has a longer small intestine this is because it requires long small intestine to digest the cellulose which it gets from the plant it feeds on. Tiger needs the smallest small intestine so that the meat can be easily digested.