Recording of Metridium Field started in February 2003, and now included Jason Divincenzo on drums. In addition to the two aforementioned songs, the album contained the additional tracks "Neonate", "Namor Versus the Siren", "Summit", and "Metridium Field", as well as two non-musical tracks, "Megaptera in the Delta" and "Eating Machine". Giant Squid hired heavy music producer Billy Anderson (Neurosis, High on Fire, Mr. Bungle, Melvins) to record and produce Metridium Field in Sacramento at the recording studio The Hangar. AJ Welham was assistant engineer for the week long session, and Brandon Oreno later recorded much of the vocals on the record. The album was mastered by Eric Broyhill at Monster Lab Audio in Sacramento. During the middle of the recording process, Aaron Gregory's father was killed in a motorcycle accident, which delayed the eventual release until April 2004. Five months later, Gregory and Zeitler married.
In 2005, Giant Squid self-released five-hundred hand made copies of another album titled Monster in the Creek, also under Tyrannosaurus Records, which was recorded mostly live and strictly analog to two-inch/sixteen track tape at the Hangar recording studio with engineer Eric Broyhill. It contained select songs about the Jersey Shore shark attacks of 1916, with titles such as "Monster in the Creek" and the instrumental "Lester Stillwell", named after the 12-year-old boy killed during the attacks, as well as the tracks "Dead Man's Fog", "Age of Accountability", "Throwing a Donner Party", and "Dare We Ask the Widow". Monster in the Creek featured Mike Conroy on drums and Andy Southard on keyboards and additional vocals, giving the band three lead vocalists for a short while. Relieved of her keyboard duties, Aurielle became a full-time guitar player in the band.
The band toured the East Coast and into Canada in March 2006 with label mates The Gathering and Unexpect, with Jason Rufuss Sewell playing keyboards and Tim Conroy performing his trumpet parts live. The band then toured the Midwest and West coast in July 2006 with label mates Stolen Babies, a few select dates with friends Prize Country, as well as playing the CD release of The End Records veterans Agalloch in Portland, Oregon. This time around, Tim Conroy took over keyboard duties as well as playing his trumpet parts live. Immediately following this tour, the Conroy brothers left the band and Austin.
Giant Squid played a handful of Austin shows with Kimberley Freeman and Scott Sutton (both from Austin bands Ghetto Princess and One Eyed Doll) on keyboards and drums respectively. One of these included opening for the band's idols, Isis, at the Austin venue Emo's. Giant Squid played its last show with this lineup, and as an Austin local band, at Room 710, October 20. Aurielle Gregory parted ways with the band in November 2006. Kimberely Freeman left shortly after. Aaron, Beeson, and Sutton returned to California in December. Aaron and Aurielle divorced in May 2007.
Jackie Perez Gratz, cello player of Amber Asylum fame, joined Giant Squid in January 2007 as both vocalist and full time cello player. As a four piece, Giant Squid embarked on its longest tour yet—thirty one days (with only three days off) across the nation and into Canada. The first week of tour included San Francisco's Ludicra and Portland Oregon's Black Elk. Then, at the Austin music festival SXSW, Giant Squid's sister band Grayceon joined the tour for the remaining three weeks, in which the band also had the opportunity to share the stage with such underground artists as Tub Ring, Two Ton Boa, Ocean, and Human Wine.
Giant Squid currently calls San Francisco home, though Sutton lives in Eugene, Oregon and Beeson remains in Sacramento.
As of now, Giant Squid has announced they will be entering the studio in August to record their new album, The Ichthyologist.