We never think of evolution as particularly predictable. Surprising, yes. Awesome, yes. Predictable? Well, we love science for that reason, but still do not associate evolution with predictability. Thanks to Ed Yong, who enjoys making provocative statements that draw his reader in, for making evolution surprising in a new way:
On each Hawaiian island, stick spiders have evolved into the same basic forms—gold, white, and dark. It’s a stunning example of how predictable evolution can be.
Examples of white, dark, and gold species of stick spiders on various Hawaiian island. The top-left species is the most ancestral of them all. (Rosemary Gillespie et al.)
Most people go to Hawaii for the golden beaches, the turquoise seas, or the stunning weather. Rosemary Gillespie went for the spiders.
Situated around 2,400 miles from the nearest continent, the Hawaiian Islands are about as remote as it’s possible for islands to be. In the last 5 million years, they’ve been repeatedly colonized by far-traveling animals, which then diversified into dozens of new species. Honeycreeper birds, fruit flies, carnivorous caterpillars … all of these creatures reached Hawaii, and evolved into wondrous arrays of unique forms. Continue reading