No matter where we drive, we see the results of how our roads and cities cut animals off from the ability to move from one area to another without big risks.  The very methods that allow us to move from place to place cut animal populations off from each other.  
Birds can move from place to place, ignoring roads and towns, but even they need a place to roost, food and water if that are to follow ageless migration patterns.  Troops of monkeys can navigate the rainforest canopy virtually forever, as long as that canopy is unbroken. When roads and cities break that canopy, the journey becomes harder and more dangerous.  
We help describe in age-appropriate complexity, the needs for animal and plant species to be connected. And we show how when populations become isolated and cut off, that they weaken as a species and risk localized extinction over time.