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
23%
0%
64%
12%
39
flagGreece
28%
4%
60%
8%
25
flagRepublic of Ireland
36%
0%
56%
6%
30
flagFrance
39%
5%
50%
5%
38
flagthe United States
36%
1%
49%
11%
318
flagUkraine
28%
4%
48%
17%
375
flagSpain
41%
0%
47%
11%
34
flagItaly
37%
3%
46%
12%
308
flagGermany
29%
4%
46%
18%
228
flagthe United Kingdom
33%
1%
45%
18%
188
flagIndia
46%
5%
45%
2%
114
flagthe Netherlands
50%
0%
45%
4%
22
flagBelarus
33%
3%
39%
24%
33
flagRussia
30%
5%
38%
24%
170
flagKazakhstan
35%
6%
38%
19%
31
flagBrazil
33%
5%
38%
16%
18
flagCanada
34%
3%
37%
24%
29
flagPoland
41%
3%
36%
17%
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