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%
0%
91%
0%
24
flagAustria
9%
0%
85%
4%
21
flagAustralia
16%
2%
79%
2%
43
flagCzech Republic
18%
18%
63%
0%
11
flagGreece
28%
4%
60%
8%
25
flagFrance
31%
10%
57%
0%
19
flagRepublic of Ireland
35%
0%
55%
10%
20
flagUkraine
31%
2%
50%
14%
221
flagGermany
27%
2%
50%
18%
119
flagthe United States
37%
1%
49%
11%
271
flagthe United Kingdom
31%
1%
46%
19%
123
flagIndia
50%
5%
43%
1%
88
flagthe Philippines
42%
7%
42%
7%
14
flagMalaysia
58%
0%
41%
0%
12
flagRussia
28%
4%
40%
24%
105
flagPoland
42%
3%
35%
17%
14611
flagItaly
47%
1%
35%
14%
76
flagBelarus
37%
4%
33%
25%
24
flagCanada
38%
4%
28%
28%
21
flagKazakhstan
35%
7%
28%
28%
14