Dinosaur is the debut album by Dinosaur Jr., released in 1985. The album exhibits a folkier side of the band than on future releases, but some of the tracks on the album showed off a much heavier, more hardcore punk-based side to the band in songs such as "Does it Float", "Mountain Man", and "Bulbs of Passion".
The album was originally released when the band was still known simply as Dinosaur, before a lawsuit forced the name change to Dinosaur Jr. Therefore, it was originally a self-titled album, but subsequent issues kept the Dinosaur title.
"Bulbs of Passion" was not featured on the original vinyl LP; it was a b-side to the "Repulsion" single. Subsequent reissues on cassette and compact disc featured it as the last song. The 2005 reissue on Merge Records placed "Bulbs of Passion" as the first track at J Mascis' request. "Yeah, I asked for that," J recalls, "because [that song] gave our new direction - it felt like we were our own sound." Also featured was a 1985 live performance of "Does It Float" as a bonus track to close out the album.