The arrival of extremely rare elephant twins, caught on camera for the first time, sets their mother an "almost impossible" challenge, according to Sir David Attenborough.
The natural historian, 95, gives the warning on the next episode of his documentary series Dynasties II - which continues with its second episode on Sunday (March 27).
Producers of the BBC show were thrilled when they discovered that Angelina - the female elephant they were following in Kenya's Amboseli National Park - had given birth to son Atlas and, four days later, daughter Alana.
