This series might be one of the most challenging old-school manga to review, but who am I to back down from a challenge?
GON, by Masashi Tanaka. First published in 1991 and first published in North America in 2007.
Gon is a tiny little tyrannosaur with a big attitude. He has somehow survived the Mesozoic, and now finds himself facing off against some of the biggest, toughest predators in the modern animal world.