"Tigers are a kind of animal."
Not animals
Pretty sure the pattern is always: X is/are a kind of (Y singular)
Penguins are a kind of bird.
Wolves are a kind of predator.
Whales are a kind of mammal.
9. April 2018
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Tigers are a kind of animal. Kinda hard to explain but in this case animal is not plural because a tiger is one type of animal not multiple animals. So tiger can be plural because you are talking about tigers generally.
Correct me if i am wrong but as native speaker the second option doesn't sound correct.
Source: Native Speaker
9. April 2018
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