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
8%
4%
88%
0%
25
flagAustria
9%
0%
86%
4%
22
flagAustralia
16%
2%
79%
2%
43
flagGreece
28%
4%
60%
8%
25
flagFrance
33%
9%
57%
0%
21
flagRepublic of Ireland
39%
0%
52%
8%
23
flagthe United States
36%
1%
50%
11%
280
flagUkraine
30%
3%
50%
15%
252
flagGermany
28%
2%
49%
18%
138
flagIndia
49%
5%
44%
1%
93
flagthe United Kingdom
34%
1%
43%
19%
141
flagRussia
28%
4%
41%
24%
114
flagMalaysia
60%
0%
40%
0%
15
flagthe Philippines
46%
6%
40%
6%
15
flagSpain
46%
0%
40%
13%
15
flagItaly
45%
1%
38%
14%
97
flagPoland
42%
3%
35%
17%
15001
flagBelarus
37%
4%
33%
25%
24
flagKazakhstan
37%
6%
31%
25%
16
flagCanada
38%
4%
28%
28%
21