Critics laughed, and he removed it from later editions, but Charles Darwin privately continued to believe that whales evolved from a “race of bears.”
In the wild, all organisms must live within their niche. There are no wild polar bears in Arizona, and no iguanas in Alaska.
This is a case of evolutionary biology trying to explain away the data that otherwise was not directly expected under their model.
I consider this simple argument as a final nail in the coffin of Darwinian unguided evolution.
Eyes with lenses are believed to have evolved independently multiple times, but all evolutionary scenarios face insurmountable barriers.