Re: No living organism directly utilizes fire as a primary biological energy source.
Yes, you make a good point.
On the other hand, I felt the author was saying that land animals could not have evolved into their current size without the after effects of fire.
Like the wooly mammoth, during the ice ages.
Or the African and Indian Elephants, or the giraffe and hippopotamus.
All dependent on cooking for their size...?
Now, if you were talking about the average feminist American land whale...