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
8%
0%
91%
0%
24
flagAustria
11%
0%
82%
5%
17
flagAustralia
17%
2%
77%
2%
35
flagGreece
30%
4%
56%
8%
23
flagRepublic of Ireland
40%
0%
53%
6%
15
flagUkraine
31%
2%
51%
13%
201
flagthe Netherlands
50%
0%
50%
0%
10
flagGermany
30%
1%
47%
19%
101
flagthe United Kingdom
31%
1%
46%
20%
105
flagthe United States
40%
2%
45%
11%
237
flagthe Philippines
45%
0%
45%
9%
11
flagIndia
49%
5%
43%
1%
87
flagItaly
36%
2%
43%
17%
41
flagMalaysia
58%
0%
41%
0%
12
flagFrance
50%
8%
41%
0%
12
flagRussia
30%
4%
39%
24%
94
flagPoland
43%
3%
34%
17%
14233
flagKazakhstan
25%
8%
33%
33%
12
flagBelarus
40%
4%
27%
27%
22
flagCanada
40%
5%
25%
30%
20