What is the name of the turtle in 'Yertle the Turtle'?

What is the name of the turtle in Yertle the Turtle? Yertle. He is the title character and self-proclaimed king of the pond in Dr. Seuss's story, first published in 1958 as part of Yertle the Turtle and Other Stories.

Yertle wants to see farther and rule more territory, so he orders the other turtles to stack themselves beneath him. Mack, the turtle at the bottom, repeatedly complains that the pile is uncomfortable and asks for a rest. Yertle ignores him, showing how unchecked authority can turn a leader's ambition into cruelty.

The story ends when Mack burps, jolting the stack and sending Yertle into the mud. That small act breaks the king's elevated position and undercuts his claim to absolute power. Mack is an important character, but he is not the title turtle; Burtle and Franklin are not characters in the original story.