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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dogs
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rats
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flagSweden
0%
0%
100%
0%
21
flagAustralia
20%
4%
70%
4%
24
flagGermany
20%
1%
56%
21%
64
flagGreece
23%
7%
53%
15%
13
flagRepublic of Ireland
41%
0%
50%
8%
12
flagthe United Kingdom
33%
1%
44%
20%
86
flagthe United States
43%
1%
43%
11%
210
flagUkraine
38%
2%
43%
16%
97
flagIndia
52%
5%
40%
1%
76
flagRussia
29%
1%
38%
28%
67
flagMalaysia
63%
0%
36%
0%
11
flagPoland
43%
3%
34%
17%
13434
flagBelarus
33%
5%
27%
33%
18
flagItaly
45%
0%
27%
27%
11
flagCanada
42%
5%
26%
26%
19