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
4%
0%
95%
0%
23
flagAustria
13%
0%
80%
6%
15
flagAustralia
17%
3%
75%
3%
28
flagArmenia
30%
0%
70%
0%
10
flagRepublic of Ireland
40%
0%
53%
6%
15
flagGreece
26%
6%
53%
13%
15
flagUkraine
31%
1%
51%
14%
166
flagGermany
28%
1%
50%
20%
84
flagthe United Kingdom
31%
1%
47%
19%
96
flagItaly
30%
0%
47%
21%
23
flagthe United States
41%
1%
45%
11%
226
flagIndia
49%
6%
43%
1%
83
flagMalaysia
58%
0%
41%
0%
12
flagthe Philippines
50%
0%
40%
10%
10
flagKazakhstan
30%
0%
40%
30%
10
flagRussia
33%
2%
36%
26%
80
flagPoland
43%
3%
34%
17%
13861
flagBelarus
35%
5%
30%
30%
20
flagCanada
42%
5%
26%
26%
19