Which animal class has the most species?
crustaceans
arachnids
insects
birds
About 60% of all known species are insects.
reach: rather globalanimalsnaturezoology
Answers by country
crustaceans
arachnids
insects
birds
answers
Republic of Ireland17
Greece16
Unknown30
Egypt10
Italy10
Germany223
the United Kingdom132
Poland13621
India245
Switzerland13
the United States475
Austria31
Australia50
Canada28
the Netherlands17
Malaysia14
Pakistan32
the Philippines21
France10
Nigeria12