Scenting Ability
The Bloodhound's physical characteristics account for its ability to follow a scent trail left several days in the past. Under optimal conditions, a Bloodhound can detect as few as one or two cells. The Bloodhound's nasal chambers (where scents are identified) are larger than those of most other breeds. The large, long pendent ears serve to prevent wind from scattering nearby skin cells while the dog's nose is on the ground; the folds of wrinkled flesh under the lips and neck—called the shawl—serve to catch stray scent particles in the air or on a nearby branch as the Bloodhound is scenting, reinforcing the scent in the dog's memory and nose.
The number of olfactory receptor cells are 4 billion in a bloodhound, compared to just 5 million in a human and 100 million in a rabbit
The surface area of bloodhound olfactory epithelium is 59 sq.in. compared to human's 1.55 sq.in. (10 sq.cm.)
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