A pleasantly straightforward doc about the noble killer whale - quite a remarkably complex animal that I actually found I didn't know a great deal about until I saw this programme. The fact that they are "the single most widespread mammal globally apart from humans" was new to me - and the methodical glance at the extremely complex differentiations between groups depending on prey was remarkably welcome. Their behaviour is fascinatingly intelligent - and the case of a disabled whale, either helped deliberately or at least not hindered by the behaviour of their pod-mates. There's a sort of tenuous attempt to link these disparate studies of their behaviour and call-signs back to a 1964 clip of a Vancouver-based expert attempting to decipher their language that never quite lands - these Whales are clearly too diversified to pigeonhole to a single scientific question or even a single documentary - I'd certainly be happy with a deeper dive with these mysterious seabeasts.