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%
86%
4%
22
flagAustralia
16%
2%
79%
2%
43
flagGreece
28%
4%
60%
8%
25
flagFrance
31%
10%
57%
0%
19
flagRepublic of Ireland
35%
0%
55%
10%
20
flagUkraine
31%
3%
50%
14%
228
flagthe United States
37%
1%
49%
11%
272
flagGermany
28%
2%
48%
19%
125
flagthe United Kingdom
32%
1%
46%
19%
130
flagMalaysia
53%
0%
46%
0%
13
flagIndia
49%
5%
43%
1%
91
flagRussia
29%
4%
40%
24%
109
flagthe Philippines
46%
6%
40%
6%
15
flagPoland
42%
3%
35%
17%
14756
flagItaly
47%
1%
35%
15%
80
flagSpain
50%
0%
35%
14%
14
flagBelarus
37%
4%
33%
25%
24
flagCanada
38%
4%
28%
28%
21
flagKazakhstan
35%
7%
28%
28%
14