There may be more to the story, though. Another study published in 2012, this one done in Costa Rica, came to a similar conclusion about the oily coating. But the Costa Rican study also used video analysis, which showed other adaptations: A spider moves its hind legs across the capture threads at an angle that minimizes the glue's effects, and tiny barbs on the bristles of its feet, or tarsi, help keep its legs from sliding into the goo. The idea that a spider might have multiple ways of avoiding snaring itself doesn't surprise Opell. "If it's an important thing to the spider," he says, "there probably are several mechanisms that have evolved to contribute to the nonsticking ability."