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Animals that migrate across land face unique challenges because their migratory paths often cross or are interrupted by roadways and other human developments. Not only does this development impede or alter migration routes, but in the case of road crossings, it also can be a dangerous situation for animals and humans. USGS scientists are working with Federal, State, and private entities to provide solutions and mitigate these roadway hazards. For small animals, human developments can be an even bigger challenge, limiting seasonal movements to reach critical habitat for breeding. The USGS is improving our understanding of how certain species are connected across the landscape at different times of the year and is developing strategies that provide options for safe migration routes that avoid barriers to movement.