A graphic novel is a type of comic book usually with a long and complex storyline similar to those of novels. The term also encompasses comic short story anthologies, and in some cases bound collections of previously published comic book series.

Graphic novels are often published in a better format than the comic magazines, using the same materials and methods as printed books, and are generally sold in bookstores and specialty comic book shops rather than at newsstands.

Y: THE LAST MAN

Y: The Last Man is a comic book series by Brian K. Vaughan and Pia Guerra published by Vertigo beginning in 2002. The series is about the only man to survive the apparent simultaneous death of every male mammal (barring the same man's pet monkey) on Earth. 
The series was published in sixty issues by Vertigo and collected in a series of ten paperback volumes (and later a series of five hardcover "Deluxe" volumes). The series' covers were primarily by J. G. Jones and Massimo Carnevale. 
The series received five Eisner awards.


http://en.wikipedia.org/wiki/Y:_The_Last_Man


PRIDE OF BAGHDAD


Pride of Baghdad is a graphic novel written by Brian K. Vaughan and illustrated by Niko Henrichon released by DC Comics' Vertigo imprint on September 13, 2006.
The story is a fictionalized account of the true story of four African lions that escaped from the Baghdad Zoo after an American bombing in 2003.
The book won the IGN (Imagine Games Network) award for best original graphic novel in 2006.

http://en.wikipedia.org/wiki/Pride_of_Baghdad