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%
66%
11%
42
flagGreece
26%
3%
61%
7%
26
flagRepublic of Ireland
35%
0%
55%
8%
34
flagthe United States
34%
1%
52%
10%
368
flagFrance
36%
6%
52%
4%
46
flagItaly
33%
2%
51%
11%
387
flagGermany
28%
4%
50%
16%
291
flagthe United Kingdom
32%
1%
48%
16%
206
flagSpain
41%
0%
47%
11%
36
flagUkraine
29%
4%
46%
17%
418
flagIndia
44%
5%
44%
4%
118
flagCanada
33%
3%
40%
23%
30
flagthe Netherlands
48%
0%
40%
11%
27
flagRussia
31%
5%
38%
23%
178
flagBelarus
36%
2%
38%
22%
36
flagPoland
41%
3%
36%
18%
16648
flagKazakhstan
39%
7%
34%
18%
38
flagSwitzerland
40%
0%
27%
31%
22