Which birds use their beaks upside down?

toucans
flamingos
storks
penguins
Flamingos filter-feed on brine shrimp and blue-green algae. Their beaks are specially adapted to separate mud and silt from the food they eat, and are uniquely used upside-down. The filtering of food items is assisted by hairy structures called lamellae which line the mandibles, and the large rough-surfaced tongue.
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toucans
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flagSweden
7%
88%
0%
3%
26
flagSouth Africa
21%
71%
7%
0%
14
flagAustralia
22%
63%
12%
1%
66
flagItaly
37%
56%
6%
0%
16
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35%
47%
0%
17%
17
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40%
46%
6%
6%
15
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37%
45%
9%
5%
191
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36%
45%
9%
9%
11
flagIndia
30%
43%
19%
6%
323
flagPoland
48%
40%
4%
5%
14891
flagthe United States
41%
39%
12%
5%
475
flagCanada
47%
33%
0%
14%
21
flagMalaysia
33%
33%
26%
0%
15
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59%
28%
3%
6%
406
flagthe Philippines
40%
28%
24%
4%
25
flagPakistan
27%
27%
12%
30%
33
flagAustria
60%
26%
6%
4%
63
flagNigeria
50%
25%
8%
16%
12
flagRepublic of Ireland
42%
19%
19%
9%
21
flagSwitzerland
70%
14%
10%
2%
48