Evolution
9pm, BBC Two
Which animal was the first to poo? Chris Packham’s belting biology lesson continues with the story of the bat – and the origins of its insatiable hunger are in the urbilaterian, an animal that floated about in the waters of the Ediacaran period, about 570m years ago. Food entered and exited through one hole … until a vital mutation: “The anus was a breakthrough!” Hollie Richardson
