[PeterPrinciple]

In the first edition of “On the Origin of Species” in 1859, Charles Darwin speculated about how natural selection could cause a land mammal to turn into a whale. As a hypothetical example, Darwin used North American black bears, which were known to catch insects by swimming in the water with their mouths open:

“I can see no difficulty in a race of bears being rendered, by natural selection, more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale,” he speculated.
The idea didn’t go over very well with the public. Darwin was so embarrassed by the ridicule he received that the swimming-bear passage was removed from later editions of the book.

[BroJoeK]

PeterPrinciple: "Darwin was so embarrassed by the ridicule he received that the swimming-bear passage was removed from later editions of the book."

And yet later discoveries showed it to be a pretty good analogy.