Heaviest / land animals

Can I say,

(a) An elephant was the heaviest animals on land. No.
The elephant is one of the heaviest (of all the) land animals. (They are not extinct!)
(b) The elephant is the land animals. No.
The elephant is a land animal.
(c) The elephant is living / lives on the land. OK

One Question

You told me that fishes are noncount nown so what about elephants.

Why it is "The Elephants" instead of "Elephants".

Elephant lives on the land

or maybe

Elephants live on the land.

Please, help me. I'm very poor with the use of "the".

Hi pag:

"The elephant" here refers to a particular species of animal, not to a particular individual.

Example:

The elephant is a heavy land animal that has a long probiscus and lives on land. (We are describing the characteristics of the animals that belong to the elephant species.)

Elephants (now we refer to the collection of all the living individuals)

Thanks.

Thanks,

Can I say,

The elephant is on the land.

Yes, you certainly can say this. You mean a particular individual animal.