lucas21cThen, how about "Lions are the king of beasts?" Should it also be "Lions are the kings of beasts?"
Its leaves look like needles. (OK) Lions are the king of beasts. (OK) Its leaves look like the needles. (not correct) BUTLions are the king of beasts. (correct)
1. Its leaves look like needles. (OK) 2. Lions are the king of beasts. (OK) 3. Lions are the king of beasts. (correct) Lions are the kings of beasts. (see 3 above)
Sorry that I can't understand what you said. It seems to me that you didn't still make your grammatical judgement on the sentence, "Lions are the kings of beasts." Could you tell me what "see 3 above" means, 'see #3' or 'see the above three sentences'? In any case, actually, I wouldn't draw any conclusion about the grammatical validity of "Lions are the kings of beasts" from you answ
The natural expression is "The lion is the king of beasts". "The lion", singular, represents the species as a whole.
In my opinion, neither "Lions are the king of beats" nor "Lions are the kings of bests" is natural. The former is not grammatical and the latter not idiomatic