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%
20
flagGermany
20%
0%
63%
15%
44
flagGreece
25%
8%
58%
8%
12
flagAustralia
35%
7%
57%
0%
14
flagUkraine
39%
1%
44%
15%
79
flagIndia
53%
4%
40%
1%
69
flagRussia
30%
1%
39%
28%
53
flagthe United Kingdom
36%
1%
38%
24%
75
flagthe United States
48%
2%
36%
12%
183
flagBelarus
35%
0%
35%
28%
14
flagPoland
44%
3%
33%
17%
13049
flagMalaysia
70%
0%
30%
0%
10
flagCanada
38%
5%
27%
27%
18