Mammals Main cast, played by David Attenborough Episode 1x01: Dark (Mar 31, 2024) Episode 1x02: The New Wild (Apr 7, 2024) Episode 1x03: Water (Apr 14, 2024) Episode 1x04: Cold (Apr 21, 2024) Episode 1x05: Heat (Apr 28, 2024) Episode 1x06: Forest (May 5, 2024)