Daddy longlegs look like they have two eyes. That doesn’t count the hidden ones
Two sets of vestigial eyes shed light on the arachnids’ evolutionary history
![A macroscopic image of a daddy longlegs spider. Two eyes in the front of the head are clearly visible.](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2024/03/031124_mp_daddy-longlegs_feat.jpg?fit=1030%2C580&ssl=1)
Despite its two-eyed appearance, Phalangium opilio has six peepers. The four extra eyes — leftovers of evolution — shed light on the evolutionary history of daddy longlegs.
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