"Animals" is both a progressive rock album and a concept album, focusing on the social-political conditions of mid-1970s Britain, and was a change from the style of their earlier work. Tension within the band during production culminated in keyboardist Richard Wright being fired two years later. The album's cover shows an inflatable pig floating between two chimneys of Battersea Power Station, conceived by the band's bassist and lead songwriter Roger Waters, and was designed by long-time collaborator Storm Thorgerson. The band released no singles from the record, but promoted it through the In the Flesh tour. Waters' agitation with audiences during this tour inspired their next record, "The Wall".