What Time Is It, Mr. Crocodile, illustrated by Doug Cushman. Harcourt, 2004.

"A zingy original tale for children needing a brush-up on clock-reading, schedule-keeping—or the perils of keeping up with five pesky monkeys. . . . Sierra's lively text . . . [makes] any time the right time for this irresistible rhyme."
  Kirkus Reviews (starred review)

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Mr. Crocodile wants to complete his to-do list, but the monkeys won't cooperate.