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%
83%
5%
18
flagAustralia
17%
2%
77%
2%
35
flagGreece
29%
4%
58%
8%
24
flagRepublic of Ireland
41%
0%
52%
5%
17
flagUkraine
32%
2%
51%
13%
203
flagthe Netherlands
50%
0%
50%
0%
10
flagGermany
30%
1%
48%
19%
102
flagthe United Kingdom
32%
1%
46%
19%
106
flagthe United States
40%
2%
45%
11%
237
flagthe Philippines
45%
0%
45%
9%
11
flagIndia
49%
5%
43%
1%
87
flagMalaysia
58%
0%
41%
0%
12
flagFrance
50%
8%
41%
0%
12
flagRussia
30%
4%
39%
24%
94
flagItaly
41%
2%
39%
16%
48
flagPoland
43%
3%
34%
17%
14263
flagKazakhstan
25%
8%
33%
33%
12
flagCanada
38%
4%
28%
28%
21
flagBelarus
40%
4%
27%
27%
22