One of my all-time favorite manga series is Masashi Tanaka's Gon, a wonderful comic about a take-no-duff little dinosaur living in the present natural world. Tanaka is a fantastic draftsman and storyteller; there's no dialog or sound effects in Gon, just expertly crafted drawings of animals and their surroundings. The way that Tanaka is able to get emotion out of his realistic animal characters is astounding. Oh, and it's really funny too.
Gon was the first manga series published by DC, pre-CMX (under the Paradox Press imprint). Five volumes came out, that was a while ago and they're out of print. But potential good news: in an interview with Newsarama, Gail Simone lets slip that DC/CMX is likely bring back Gon, bringing the old volumes back in print and bringing out new volume too!