Although many locals are used to spotting whales in the Cape waters, it is very rare to hear of orcas in the Langebaan Lagoon.
Images of two killer whales have been shared widely on social media after they were sighted in the lagoon earlier this week.
Conservationists Meredith Thornton says it is likely that the orcas where hunting for food, as they are very specialised feeders.
They were probably looking for marine mammals and most likely dolphins.— Meredith Thornton, Reasearch Co-ordinator at Dyer Island Conservation Trust
Thornton says it is also highly unusual that the pair were travelling together and that they had flopped over dorsal fins.
Take a listen: