Walking with Monsters

Walking with Monsters (distributed in North America as Before the Dinosaurs - Walking with Monsters) is a three-part British documentary film series about life in the Paleozoic and early Mesozoic eras. It is a prequel to "Walking with Dinosaurs" and was written and directed by Chloe Leland and by Tim Haines and narrated by Kenneth Branagh. It first aired on BBC Three and BBC One in November and December 2005. 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).
Drawing on the knowledge of over 600 scientists, the series depicts Paleozoic history, from the Cambrian Period (530 million years ago) to the Early Triassic Period (248 million years ago),
and extinct arthropods, fish, amphibians, synapsids, and reptiles.
Episodes.
The series first aired as a single 90-minute installment on BBC Three, followed by a weekly episodic broadcast on BBC One. The first episode received 4.57 million viewers on BBC One; Viewing figures for the remaining broadcasts did not reach the Top 30 and/or Top 10 Programs. The series has also aired as a two-hour special on the Canadian and American Discovery Channel with an alternate narrator, although Branagh's narration can still sometimes be heard.
Unlike previous series, each period begins with "tech specs" highlighting specific traits of that period; as well as the location based on fossil finds from that period, they also show the period's oxygen content (from up to the Carboniferous)/global temperature (from the Early Permian onwards), and hazards. It also features evolution sequences between periods and looks inside creatures to show new evolutionary traits that humans -within the context of the series- would later adopt (such as the heart of "Petrolacosaurus" or "Euparkeria's" hip joint). The major difference is that, similar to "Sea Monsters" before it, there are only three episodes, each containing two to three segments in time, instead of six full episodes.