[7][8] The band is currently signed to independent label Dew Process in Australia and Fiction Records in the UK.

In 2007, Sean Caskey and former drummer Dan Koyama met during high school, starting a band called "The Cairos"[9] that would later become Last Dinosaurs.

The hit track "Honolulu" from Back from the Dead was placed on high rotation on national broadcaster Triple J, giving the band significant traction.

In June 2011, the band started a Tumblr blog narrating their recording process for the album with producer Jean-Paul Fung at BJB Studios in Sydney, Australia.

[17] On 23 July 2013, Sam Gethin-Jones announced that he was leaving the band in order to pursue a different musical sound and personal pathway.

Sloane had previously worked with the band as a bassist and music video director for "Zoom," "Time and Place," and "Andy."

The second single, "Apollo," was also premiered by Marigliano on Triple J's Good Nights program on 15 July 2015, along with the announcement of Last Dinosaurs' second album, Wellness.

On 30 September 2019, Last Dinosaurs released a new single titled "FMU" before beginning their US/EU tour, premiering it on Triple J's "Good Nights" show with Ebony Boadu.

It has been spoken of several times in interviews that the meaning of the song's lyrics relates to the tense relationship between Hong Kong and China.

"[27] They proceeded to release, in the succeeding months, five more singles including "Look Back" on 25 March, "CDMX" on 5 May, "The Hating" on 23 June, "Auto-Sabotage" on 4 August, and "Put Up With The Weather!"

The band and James Agnus co-produced the LP once Lachlan returned to Australia, where he was recorded as the album's lead vocalist.

[33] KYORYU has been characterized by both Caskeys as being a concept album focused in a dystopian future with AI satellites and outer space exploration.

[34][35] The EP titles, RYU and KYO, are shortened versions of their Japanese middle names: "Ryusuke" for Sean, and "Kyohei" for Lachlan.