Science communicator Brian Switek said "If one reads Wells' criterion for his bogus A–F grading scale for the textbooks in Icons, it quickly becomes apparent that even publishing illustrations that resemble Haeckel's to illustrate his folly will garner the book a D, the only difference between a D and an F in Wells' mind being a 'D' grade book selecting a few embryos rather than publishing the full swath Haeckel originally doctored." PZ Myers says of Wells's claim about the use of Haeckel drawings in modern textbooks "They repeat the claim that Haeckel's embryos and all that silly recapitulation theory are still endemic in biology textbooks. It's not true, no matter how much they whine about it. I've gone over a number of these textbooks, and what you typically find at worst is a figure of the Haeckel diagrams for historical interest with an explanation that rejects recapitulation theory; more often what you find are photos or independently redrawn illustrations of the embryos."