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
22%
0%
65%
12%
40
flagGreece
28%
4%
60%
8%
25
flagRepublic of Ireland
35%
0%
54%
9%
31
flagFrance
40%
5%
50%
5%
40
flagthe United States
36%
1%
49%
11%
333
flagUkraine
28%
4%
47%
17%
392
flagItaly
37%
3%
46%
12%
324
flagthe United Kingdom
33%
1%
46%
17%
195
flagGermany
30%
4%
45%
17%
246
flagIndia
46%
5%
45%
2%
114
flagSpain
42%
0%
45%
11%
35
flagthe Netherlands
47%
0%
43%
8%
23
flagBelarus
32%
2%
41%
23%
34
flagCanada
33%
3%
40%
23%
30
flagRussia
30%
5%
39%
23%
176
flagPoland
41%
3%
36%
17%
16374
flagKazakhstan
39%
7%
34%
18%
38
flagSwitzerland
40%
0%
25%
35%
20