What did the kangaroo say about Horton's act?

From the text:

"Humpf!" humpfed a voice. 'Twas a sour kangaroo.
And the young kangaroo in her pouch said "Humpf!" too.
"Why, that speck is as small as the head of a pin.
A person on that? . . . Why, there never has been!"

"I think you're a fool!" laughed the sour kangaroo
And the young kangaroo in her pouch said, "Me, too!
You're the biggest blame fool in the Jungle of Nool!"
And the kangaroos plunged in the cool of the pool.