1. The length of a male lion is between 1.8 and 2.6 meters.
2. A male lion is 1.8 to 2.6 meters in length.
3. The male lion ranges from 1.8 to 2.6 meters in length.
I'm being a bit fussy, but it is more precise to say it is the length, not the lion, that is between 1.8 and 2.6 meters. You can ignore this distinction if you like but it does improve clarity.
I used singular ("lion") rather than plural just to show you the possibility. You can use plural if you like.
In #3, "lion" is the name of a species, not a particular lion.