UMWELT
OLFACTION

Certain animals have evolved specific sensory abilities much wider than our own...

Photo source: Dog Club, UK.
The "primitive" olfactory sense is quite poorly developed in humans. In sharks a third of the brain is devoted to chemoreception. Gould and Gould (1994: 19) provide a humbling perspective:

A well trained human—a perfumer, for example—can identify at best a few thousand smells, while dogs can apparently distinguish any number of individual humans by scent alone. Bloodhounds perform this feat with no more odor than passes through the soles of a person’s soles.

Gould, James L. and Gould, Carol Grant (1994) The Animal Mind. Scientific American Library, New York.

Mosquito olfactory apparatus, Photo source: Zweibel Laboratories