Documentary

The Secret Life of the Zoo CHANNEL 4, 8.00PM

Night falls at Chester Zoo, which means its 800 nocturnal inhabitants start to wake up. Aardvark Koos appears to be looking for romance, and it’s time for mouse-deer Una to leave her parents and meet a mate. GT

House of Saud: A Family at War

BBC TWO, 9.00PM

Social media has helped to destabilise and even overthrow dictatorships across North Africa and the Middle East; and recently, the behaviour of Saudi Arabia’s ruling family has been placed under a fierce spotlight. The final edition of Michael Rudin’s valuable series assesses its impact. GT

Love and Hate Crime

BBC ONE, 10.45PM; NI, 11.10PM; SCOTLAND, 11.45PM; WALES, 11.40PM

First shown on BBC Three, this documentary tells the story of Sarah Graves, one of several white teenagers to be jailed for running over and killing 47-year-old black man James Anderson in Jackson, Mississippi in 2011. The case lifted the lid on the race hate that remains a terrible blight on the Deep South. GT