A group of bottlenose dolphins were seen paddling in the water near Similan Islands in Phang Nga Province, southern Thailand on April 28.
Pongsatorn Keawnikom, a wildlife worker at the Similan National Park, recorded the creatures while he was patrolling the area.
He said: "This helps us to enjoy working a lot. They greeted us so we can just appreciate them and not harm them in anyway."
Bottlenose dolphins can be found in the Thai Gulf and Songkhla Lake, together with humpback dolphins.