How to know the owner of the turtle:

You can let the turtle know the owner by feeding it by hand. When feeding, the owner should feed the food to the turtle's mouth. Be patient, every time When feeding, you can also gently stroke the turtle.

Secondly, you can pull the turtle's claws during feeding and train the handshake. Keep some food at a distance, so that the turtle can crawl to get food. The most important thing is that the owner should always accompany the turtle, and gradually the turtle will know and like the owner.