In North Amherst, Massachusetts, two tunnels beneath Henry Street were built in 1987 to help spotted salamanders travel safely between their overwintering forest habitat and spring breeding pools during the Big Night migration. Before the crossings existed, many were killed by traffic, prompting local volunteers in the early 1980s to carry them across by hand. Supported by public, academic, conservation, and private partners, the project became the first amphibian tunnels in the United States and an early wildlife crossing designed for a specific seasonal movement. Later studies evaluated their effectiveness, while volunteers and periodic road closures still protect animals that miss the entrances.