" Eighty traps seemed like a lot when we started walking. But at the end of two hours, Gordon and Tom and I haven’t collected a single snake. Maybe it’s the drought. Maybe the snake population, here in the north of the island as in the south, has passed the peak of its cycle and declined. Maybe the trap design is no good, or possibly we’re using the wrong bait. Temporarily, for whatever reason, B. irregularis has turned invisible. But the consequences of its presence surround us like a web. "

― David Quammen , The Song of the Dodo: Island Biogeography in an Age of Extinctions