It wouldn’t be Christmas without Bing Crosby – what with all that snow, crooning and dancing with ladies with tiny waists.

But for orcas, there’s no such thing as a white Christmas – as the documentary Blackfish goes to show. It shines a light on animal captivity in SeaWorld, the famed aquarium amusement park in America, and the cruelty these animals suffer causing them to lash out on their trainers.

It’s a truly shocking look into why animals should not be kept in captivity. If White Christmas is a core warmer, Blackfish is definitely a core shaker.

Which should I watch? Blackfish. White Christmas isn’t going to get you campaigning for the rights of cetaceans now, is it?