Comment Barely linked to evolution at all (Score 1) 169
Evolution does not dictate that an animal will always instinctively do what will extend its life. There are numerous examples of simple traps humans set where the animal could easily escape if it would give up the bait but they deliberately stay tapped. Animals introduced to new environments have been seen ingesting toxic plants. People obviously do many things that are harmful to their health.
Evolution says that nature will breed out traits that did not extend an animals life. Giving a dumbed down example, say a person was allergic to smoking, ad say this was passed down to his children. By not smoking him and his children would live longer lives thus giving them more opportunities to breed, and over thousands of years you might see an increase in people allergic to smoking because it naturally allowed people to live longer, it became an evolved trait.
Evolution does not work on this micro scale of every day decisions an animal decides to make. Animals to do have some psychic knowledge to be introduced to two new food and instantly know which has the optimal nutrition.