Spiders evolving disguises separately, in parallel, are another problem for Darwinism
Not that one can directly admit it. From Catherine Offord at The Scientist:
The Hawaiian stick spider has evolved the same three color morphs on multiple different islands in parallel, according to research led by biologists at the University of California, Berkeley. The team’s findings, published today (March 8) in Current Biology, provide a rare example of evolution producing the same outcome multiple times and could throw light on the factors constraining evolutionary change.
“The possibility that whole communities of these spiders have evolved convergently is certainly exciting,” Ambika Kamath, a behavioral ecologist at the University of California at Santa Barbara who didn’t take part in the study, tells The Atlantic. She adds that the study provides insight into the “deterministic processes that shape the diversity of life.”
“They arrive on an island, and boom! You get independent evolution to the same set of forms,” Gillespie says in the statement. “Most radiations just don’t do this,” she adds—although her team has previously reported a similar pattern of convergent evolution in another group of spiders in Hawaii, the spiny-legged Tetragnatha. “Now we’re thinking about why it’s only in these kinds of organisms that you get this sort of rapid and repeated evolution.” More.
First, evolution producing the same outcome multiple times is not rare; it is common.
Second, Kamath comes close to admitting that this is not a convenient finding for Darwinism: “The study provides insight into the ‘deterministic processes that shape the diversity of life’.”
But these processes are not supposed to be deterministic; they are supposed to be random. That is, natural selection acting on random mutation produces evolution (Darwinism).
On the other hand, Darwinism, as the faith position of biology, is no longer constrained by the need for consistency.
See also: Secrets of 520 million-year-old brain debated, raise conundrums
Evolution appears to converge on goals—but in Darwinian terms, is that possible?