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
23%
1%
71%
3%
52
flagAustria
18%
0%
67%
13%
37
flagGreece
28%
4%
60%
8%
25
flagRepublic of Ireland
37%
0%
55%
6%
29
flagFrance
35%
6%
54%
3%
31
flagSpain
37%
0%
51%
10%
29
flagthe Netherlands
45%
0%
50%
5%
20
flagUkraine
29%
4%
49%
16%
319
flagthe United States
36%
1%
49%
11%
301
flagGermany
30%
3%
47%
18%
192
flagthe United Kingdom
33%
1%
44%
19%
165
flagIndia
48%
5%
43%
2%
108
flagRussia
29%
5%
41%
22%
155
flagBelarus
36%
3%
40%
20%
30
flagthe Philippines
46%
6%
40%
6%
15
flagItaly
43%
2%
39%
13%
218
flagCanada
33%
3%
37%
25%
27
flagPoland
41%
3%
36%
17%
15886
flagKazakhstan
40%
4%
36%
18%
22