Not sure what your question is. Every animal in every environment can starve if there’s not enough food in a period of time to sustain life support. An animal can starve because it can’t reach the food (because it’s say hurt, sick, physically prevented by fences, predators or humans) , or because food is not available in sufficient quantity, or because it cannot extract the energy needed from the food because it is sick, stressed or because the food is not the right one for the digestive system of the animal. Animals like cows and other ruminants have multisegmented stomachs that allow them to extract nutrients from food that other herbivores like primates or say pigs can’t. So while there might be an equal amount of grass in front of a cow, a monkey and a pig, each animal will extract different amount of energy and nutrients because their digestive systems are optimized for different things.
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