The brown recluse spider (Loxosceles reclusa ... They can be identified by their eye arrangement, where "two large eyes gleam ...

This marking is not present in young brown recluses. Another way to identify the spider is the number and arrangement of its eyes. Most spiders have eight eyes but the brown recluse spiders have ...

To do this, researchers had to get clever. The unblinking lenses of a spider’s two front-facing primary eyes do not move. Instead, to look at different things, the cone-shaped inside of the eye ...