(Portland, OR) -- A 'Frog Taxi' is being used to help red-legged frogs from Forest Park make it to their breeding grounds in a Northwest Portland wetland. Red-legged frogs are a federal species of concern and they're protected in Oregon. The frogs have to navigate a four lane highway and railroad tracks to reach the wetlands. Volunteers with the Oregon Zoo scan the roadside looking for the frogs, they place them in containers and then drive them to the wetlands. After the eggs hatch, the process is reversed and the young frogs are collected and driven to the other side of the highway.