Any sort of meat (beef, chicken, fish, etc.), dairy products, eggs, and Gelatin are the big ones. There are numerous animal-derived additives used in food as well. Many vegetarian websites (for example, vegansociety.org) have comprehensive lists of animal-based foods.
Meat, dairy products.
All animal foods.
protein
Soy and animal proteins such as meat, dairy products (except butter) and eggs contain complete proteins.
The two macronutrients are carbohydrates and protein.
Cartilage supplements come from such animal sources as cattle, sheep, sharks, and chickens, with cows and sharks being the predominant sources.
The main sources of protein are animal based foods. For example meat, fish, poultry, milk, cheese and eggs.
Only in Foods that come from Animalss (its animals)
Some low carb foods that come from animal products include almost all items that are not fried or cooked in a sweet sauce such as barbecue or sweet and sour sauces.
Natural fibers come from plant, animal and mineral sources. For example cotton fiber comes from the cotton plant / boll. Linen from the flax plant.
Sources of glow foods include vegetables and fruits such as pineapples, squash, watermelon and cauliflower. Glow foods contain high amounts of minerals and vitamins.
Just like any other living organism (including human), the energy that animal's cells get come from the foods they eat.
It may be animal products (meat, milk) or vegetable (canola, soybean, nuts). It will depend on what the person eats, and what foods are popular in that area.