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
11%
7%
81%
0%
27
flagAustria
14%
0%
77%
7%
27
flagAustralia
18%
2%
75%
4%
48
flagGreece
28%
4%
60%
8%
25
flagRepublic of Ireland
35%
0%
57%
7%
28
flagFrance
36%
6%
53%
3%
30
flagthe Netherlands
47%
0%
52%
0%
19
flagthe United States
35%
1%
49%
12%
295
flagUkraine
29%
3%
49%
16%
282
flagGermany
30%
2%
48%
17%
175
flagthe United Kingdom
33%
1%
45%
19%
156
flagIndia
48%
5%
43%
2%
106
flagSpain
47%
0%
42%
9%
21
flagItaly
43%
1%
40%
13%
170
flagRussia
28%
5%
40%
23%
138
flagMalaysia
60%
0%
40%
0%
15
flagBelarus
37%
3%
37%
20%
29
flagPoland
42%
3%
36%
17%
15553
flagCanada
32%
4%
36%
28%
25
flagKazakhstan
40%
5%
35%
20%
20