Usagi first appeared in the anthology Albedo Anthropomorphics in 1984, and later in the Fantagraphics Books anthropomorphic anthology Critters, before appearing in his own series in 1987.[14] The Usagi Yojimbo series has been published by three different companies. The first publisher was Fantagraphics (volume one; 38 regular issues, plus one Summer Special and three Color Specials). The second was Mirage Comics (volume two; 16 issues). The third is Dark Horse Comics, by which Usagi Yojimbo is still being published (as volume three, over 160 issues), and who also released a fourth Color Special. A fourth publisher, Radio Comix, published two issues of The Art of Usagi Yojimbo which contained a selection of unpublished drawings, convention sketches, and other miscellaneous Usagi Yojimbo artwork. The first issue also included an original Usagi Yojimbo short story. In 2004, Dark Horse Comics published a Twentieth Anniversary hardcover volume also entitled The Art of Usagi Yojimbo.