I'd like to use no article in the second sentence. Many species are endangered like wolf and tiger. Because it sounds the same pattern to me as "These names are only for girls like Lily and Helen" See also: a species of antelope (no article) (But sadly, it seems that I have been misusing articles all the time
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WinpojMaple, I don't think the analogy you're offering is a good one - "Lily" and "Helen" are proper nouns, unlike "wolf" and "tiger".Yes, Lily and Helen are proper nouns. So the example sentence is not good.
Winpojwolves and tigers.
the wolf and the tiger.
Hi, these are what we often read.
I'm wondering is there any special "rule" when the subject is species.
WinpojYou correctly pointed out that there is no article before "antelope" in "a species of antelope". But I wouldn't say this is something specific to the word "species".
Compare:
This kind of envelope is very hard to open.
Some makes of car are extremely expensive.
These types of report tend to be lengthy and boring.