I visited Monkey Mia in the late 90s and we watched the dolphin feeding. There was a dolphin named Nicky who came in a lot. Later on we were sitting on the pier and a dolphin cruised past and I said "that looks like Nicky". The dolphin turned around and cruised back past us with one eye out of the water - clearly checking out who we were and if she knew us.
Covid relevance edit: due to Covid border restrictions I can't currently visit Monkey Mia.

