View the following related links for a couple example of a cow's digestive system.
brainpop.com
You can find such pictures on the Internet, by doing a search on your favorite search engine for such words as "cow birthing" or "calving" or "cow[s] giving birth." Click on images and you should find the kind of pictures you are looking for. Also, the cattle forum at Cattle-Today.com have several threads where members have posted pictures of cows giving birth. Such a thread can found in the related link section below.
The stomach is a part of the digestive system. It is responsible for breaking down food through the secretion of digestive enzymes and acids.
There are many places where one can find the terminology on the process of the human digestive system. One can find this information on the human digestive system Wikipedia page. One may also find this information through many different medical related websites.
In addition to the water vascular system responsible for movement and feeding, you could expect to find a digestive system in a starfish. This system includes the stomach and digestive glands for processing food.
A person can find accurate pictures of the urinary system in biology books at universities as well as anatomy textbooks. If one has internet access there are websites which provide accurate pictures as well.
If you want the drawing of the digestive system of a human being, you are likely to find one in a biology, health or nutrition book. This type of book can be obtained from the library or bookstore. Alternatively, you can find a drawing of the human digestive system via the Teach PE website.
One can find pictures of books that are available for loan on their local library's computer system. One can also find pictures of books that are for sale on sites such as Amazon, Overstock and eBay.
You can find pictures of cows and the names of the parts in any library or school library. You can also check out local bookstores.
There are plenty of pictures you can find of omnivore animals. Type omnivore into Google and you will find many pictures.
encyclopedia
On-line or in a textbook on Sheep anatomy at your local library