Madagascar (TV series) in March 2011. In this one-off programme, David Attenborough undertakes a personal journey back to Madagascar to investigate the fate of "Aepyornis", the island's extinct elephant birds. Believed to be the largest birds which have ever lived, evidence of their existence can still be found on the island. Whilst filming "Zoo Quest to Madagascar" in 1961, Attenborough pieced together a complete elephant bird egg from fragments of shell collected for him. "Madagascar" was first announced in March 2009 as a partnership between Animal Planet and BBC Worldwide. Production duties were handled by the BBC Natural History Unit in Bristol, with
Largest organisms the giant moa ("Dinornis maximus"), part of the moa family of New Zealand that went extinct around 1500 AD. This particular species of moa stood up to tall, but weighed about half as much as a large elephant bird or mihirung due to its comparatively slender frame. The heaviest bird ever capable of flight was "Argentavis magnificens", the largest member of the now extinct family Teratornithidae, found in Miocene-aged fossil beds of Argentina, with a wingspan up to , a length of up to , a height on the ground of up to and a body weight of at least