When brother and sister Nathan and Rachel Cox saw a huge dorsal fin surface near their kayak in Houhora Harbour their first thought was "great white shark".
But their concern quickly turned to excitement when they saw the marine mammal's blowhole and realised they were instead surrounded by a curious pod of orca. The pod contained several calves who were learning how to catch stingrays — one of an orca's favourite meals.
The pair set off from Pukenui about 4pm last Tuesday and about 15 minutes later, while about halfway across, they spotted the dorsal fin ominously moving towards them.
"A huge fin come up beside us and my first thought was a great white shark. Then I saw the blowhole and realised it was orca. Amazing," Mr Cox said.
"There were about 15 of them, with only three big adults, and there were lots of calves there, playing with stingrays. Trying to throw them up into the air and bashing them on the water, but it was a bit too shallow there and they weren't having much success.