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
10%
7%
78%
3%
28
flagAustralia
21%
1%
70%
5%
55
flagAustria
21%
0%
65%
12%
41
flagGreece
26%
3%
61%
7%
26
flagRepublic of Ireland
37%
0%
53%
9%
32
flagFrance
39%
4%
51%
4%
41
flagthe United States
36%
1%
50%
11%
342
flagUkraine
29%
4%
47%
17%
412
flagItaly
36%
2%
47%
12%
350
flagthe United Kingdom
32%
1%
47%
17%
198
flagSpain
41%
0%
47%
11%
36
flagGermany
30%
4%
45%
18%
255
flagIndia
45%
5%
45%
3%
117
flagthe Netherlands
45%
0%
41%
12%
24
flagBelarus
34%
2%
40%
22%
35
flagCanada
33%
3%
40%
23%
30
flagRussia
31%
5%
38%
23%
177
flagPoland
41%
3%
36%
18%
16495
flagKazakhstan
39%
7%
34%
18%
38
flagSwitzerland
40%
0%
25%
35%
20