How Well do Raptors Smell?

Most raptors do not have a well developed sense of smell. The exception are New World Vultures.

Turkey Vultures have been used to detect leaks in natural gas pipelines. A rotten meat odor is added to the gas and if there is a leak the vultures will start circling and then the leak can be repaired. There have also been studies demonstrating that Turkey Vultures can distinguish between just dead (at least 12 hours) and rancid which even Turkey Vulture's stomachs can not handle.