'Orca hunting repertoires are enormously wide and complex. They typically share whatever they catch. Most groups specialise in hunting particular kinds of food – fish, sharks, seals, whales – and do not feed on anything else except under duress. This is not only to do with local conditions: in some areas, coastal fish-eating communities share waters with more pelagic whale-eating communities, but there is no social crossover.'

https://www.lrb.co.uk/the-paper/v45/n18/francis-gooding/short-cuts