Which animal class has the most species?

crustaceans
arachnids
insects
birds
About 60% of all known species are insects.
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Answers by country

crustaceans
arachnids
insects
birds
answers
flagRepublic of Ireland
5%
0%
88%
5%
17
flagGreece
0%
12%
87%
0%
16
flagUnknown
0%
10%
82%
3%
29
flagthe United Kingdom
6%
8%
80%
3%
130
flagEgypt
0%
20%
80%
0%
10
flagItaly
0%
10%
80%
10%
10
flagGermany
4%
1%
78%
13%
207
flagPoland
5%
8%
77%
8%
13528
flagIndia
8%
4%
76%
4%
244
flagSwitzerland
23%
0%
76%
0%
13
flagthe United States
8%
7%
73%
9%
462
flagAustria
6%
10%
73%
10%
30
flagAustralia
8%
12%
68%
10%
50
flagCanada
7%
10%
67%
7%
28
flagthe Netherlands
0%
26%
66%
0%
15
flagMalaysia
7%
7%
64%
7%
14
flagPakistan
9%
12%
62%
12%
32
flagthe Philippines
4%
14%
61%
9%
21
flagFrance
10%
20%
60%
10%
10
flagNigeria
8%
25%
58%
8%
12