Buzzards can smell up to 2 miles away, and can spot a carcass hundreds of yards away. In Cali where I am at, a sub-agency of fish and game did a study about buzzards and their smelling abilities. It was amazing to read on their 2 mile scent pick up. On the other hand, Turkeys do not have a great smell capability, but they can smell. All mammalian prey which includes deer, coyote, elk etc. etc. have developed a great sense of smell, while most birds have developed a poor sense of smell. Turkeys have that poor sense of smell, and rely on their trichromatic sense of sight, which is built just like our sight, even a little more so. They can see colors, silouttes, etc. out in the field. That is just one of their defense mechanisms that they rely on. Also, turkeys can recognize landscapes, tracks, bird remains, and their roosting tress. But again, sense of smell is not powerful, not even close to a buzzard. It is not a defense mechanism.