Animals are surrounded with potential food of many different types in nature, some of which are known and others are unknown. When an animal first encounters a new type of food it typically does not eat all of it at once but rather nibbles a bit, waits for a while, nibbles a bit more, and so on. This is a time consuming and costly process, especially for a hungry animal. The animal has a choice of either continuing to eat familiar food or to try a new food type. Testing a new food entails both a potential ...