Which mammals have the best sense of smell?

dogs
cats
bears
rats
The area of nasal mucous membrane in a bear's head is 7 times greater than a bloodhound's (and one hundred times larger than in a human's). Polar bears have been seen to march up to 40 miles in a straight line to reach a prey animal they have detected.
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Answers by country

dogs
cats
bears
rats
answers
flagSweden
0%
0%
100%
0%
18
flagGermany
17%
0%
73%
8%
23
flagAustralia
40%
0%
60%
0%
10
flagUkraine
35%
0%
50%
14%
64
flagIndia
50%
4%
43%
1%
62
flagthe United Kingdom
32%
1%
38%
27%
62
flagthe United States
49%
1%
35%
12%
157
flagPoland
44%
3%
33%
17%
12487
flagRussia
37%
0%
32%
30%
40
flagBelarus
40%
0%
30%
30%
10
flagCanada
41%
5%
23%
29%
17