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A measured sniffer

Sensory Perception
We humans see the world through a primate-centric viewpoint that has influenced how we test for traits in other animals, most of whom experience the world in very different ways. One area where this bias has been apparent is in tests of animal cognition and perception, where vision is often the focal sense. Plotnik et al. branched out beyond the bounds of sight to test whether elephants, who have a well-known and impressive nose, could differentiate relative amounts of food based entirely on scent. Controlling for alternative interpretations, they found that, indeed, Asian elephants could identify buckets that had more sunflower seeds solely using olfaction. The elephants did struggle to select among the buckets when the amounts of seeds in them differed only slightly, however, this is also the case in most animals tested for visual discrimination, including humans.

Proc. Natl. Acad. Sci. U.S.A. 116 , 12566 (2019).