In james and the giant peach, what provided the power for the peach when it floated through the air

In the book 'James and the Giant Peach', the plot and reading the book reveals that the power used to make the peach float through the air was a bunch of seagulls. Since they were in shark invested water they knew that they needed to get into the sky before it was too late, so they set a trap using worm as bait for the seagulls and captured them.

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