Wildlife underpasses not only reduce the number of animals being hit by cars but also preserve movement and gene flow for the animals on both sides of the road.
The movement of genes occurs when an animal born on one side crosses the road and breeds on the other.
The three young cougars being led through this culvert by their mother will be accustomed to using it and are likely to look for mates on either side.
Photograph: Tony Clevinger/Johns Hopkins University Press
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