9 - Olfaction, the Bloodhound
Under the sleepy eyes of the bloodhound is sits the nose of a super-detective, with a sense of smell up to a million times more sensitive than that of humans. Because of the bloodhound's fine-tuned olfactory system, it is commonly used by police officers to track down the scents of missing or fugitive people. Its nose has more than 200 million olfactory cells, which can lock onto an odor and follow it for several days, despite the presence of other scents along the way. This keen sense of smell, along with the bloodhound's tenacity, makes it the ideal tracking dog.