Question: Which documentary was released first, Walking with Cavemen or Life in the Freezer?

Context articles: Monsters We Met
Ben Bartlett
Walking with Cavemen
Iceland Foods: Life in the Freezer Cabinet
Planet Earth (soundtrack)
Life in the Freezer
Mike deGruy
Clannad (visual novel)
Walking with Monsters
The Complete Guide to Prehistoric Life

Monsters We Met is a documentary produced by the BBC and later aired on Animal Planet in 2003 (under the title, Land of Lost Monsters) but also used footage from "Walking with Beasts" and "Walking with Cavemen" both made by BBC.
 The show used computer-generated imagery to recreate the life of the giant animals that lived during the last ice age and explains how early humans encountered them.
 It also features humans as the main reason to the extinction of all great animals.
Benjamin Bartlett, better known as Ben Bartlett, is a British soundtracks composer.
 He is mainly celebrated for having been the creator of the background music in BBC nature documentary series "Walking with Dinosaurs" (1999), "Walking with Beasts" (2001), "Chased by Dinosaurs" (2002) or "Walking with Monsters" (2005), among others.
 The two first ("Walking with Dinosaurs" and "Walking with Beasts") are for now the two sole Bartlett's scores having been commercialised.
Walking with Cavemen is a four-part television documentary series about human evolution produced by the BBC in the United Kingdom.
 It was originally released in April 2003.
 It was subsequently presented in the United States as a two-part series by the Discovery Channel and its affiliates.
 There was an accompanying book of the same title.
Iceland Foods: Life in the Freezer Cabinet is a British documentary television series about the Iceland supermarket chain that was first broadcast on BBC Two on 21 October 2013.
 The three-part series was co-produced with the Open University.
Planet Earth is a television soundtrack album of incidental music commissioned by the BBC Natural History Unit for its 2006 nature documentary series of the same name.
 The music was composed and conducted by award-winning composer George Fenton, and performed by the BBC Concert Orchestra.
 Fenton had previously composed scores for several BBC wildlife series, among them "Life in the Freezer", "The Trials of Life" and the predecessor to "Planet Earth", "The Blue Planet".
Life in the Freezer is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 18 November 1993.
Mike deGruy (December 29, 1951 – February 4, 2012) was an American documentary filmmaker specialising in underwater cinematography.
 His credits include "Life in the Freezer", "Trials of Life", "The Blue Planet" and "Pacific Abyss".
 He was also known for his storytelling, most notably, a passionate TED talk about his love of the ocean on the Mission Blue Voyage.
 His company, Film Crew Inc., specialized in underwater cinematography, filming for BBC, PBS, National Geographic, and The Discovery Channel.
 His notable accomplishments include diving beneath thermal vents in both the Atlantic Ocean and Pacific Ocean.
 He was a member of many deep sea expeditions and was a part of the team that first filmed the vampire squid and the nautilus.
 He was also part of the Deepsea Challenge, where James Cameron went to the bottom of the Mariana Trench.
 In 2016, production began on a feature-film documentary about his life and work titled Diving Deep.
 The documentary is planned for release in 2017.
 Additionally, Mike was well-known for his shark attack on April 2, 1978 by a grey reef shark, and was severely bitten on his lower right forearm, from which he bore scars.
Clannad (クラナド , Kuranado ) is a Japanese visual novel developed by Key and released on April 28, 2004 for Windows PCs.
 While both of Key's first two previous works, "Kanon" and "Air", had been released first as adult games and then censored for the younger market, "Clannad" was released with a rating for all ages.
 It was later ported to the PlayStation 2, PlayStation Portable, Xbox 360, PlayStation 3 and PlayStation Vita consoles.
 An English version for Windows was released on Steam by Sekai Project in 2015.
 The story follows the life of Tomoya Okazaki, a high school delinquent who meets many people in his last year at school, including five girls, and helps resolve their individual problems.
Walking with Monsters (also distributed as "Before the Dinosaurs - Walking with Monsters" or "Walking with Monsters - Life Before Dinosaurs") is a three-part British documentary film series about life in the Paleozoic, and briefly into the Mesozoic, bringing to life extinct arthropods, fish, amphibians, synapsids, and reptiles.
 As with previous "Walking with..." instalments, it is narrated by Kenneth Branagh.
 Using state-of-the-art visual effects, this prequel to "Walking with Dinosaurs" shows an epic 300 million year war between creatures before the dinosaurs.
 The series draws on the knowledge of over 600 scientists and depicts Paleozoic history, from the Cambrian Period (530 million years ago) to the Early Triassic Period (248 million years ago).
 It was written and directed by Tim Haines.
 As with some of the other BBC specials, it was renamed in North America, where its title was "Before the Dinosaurs: Walking with Monsters".
 It has also aired as a two-hour special on the Canadian and American Discovery Channel with yet another narrator, although Branagh's narration can still sometimes be heard.
 At the 58th Primetime Emmy Awards in 2006 it won the Emmy Award in the category Outstanding Animated Program (For Programming One Hour or More).
The Complete Guide to Prehistoric Life is an encyclopedia featuring 111 of the prehistoric animals from the "Walking with..." series, as well as an additional one ("Homo floresiensis").
 It was published in 2006 by Firefly Books, and written by Tim Haines with Paul Chambers.
 It accompanies all programs in the "Walking with..." series except "Walking with Cavemen", "Prehistoric Park" and "Primeval".