Having multiple populations on different migration routes decreases the chance that a disease outbreak, habitat loss or bad weather in a given area may wipe out the entire population of cranes.
(Having multiple populations on different migration routes; decreases; the chance that a disease outbreak, habitat loss or bad weather in a given area may wipe out the entire population of cranes) (a disease outbreak, habitat loss or bad weather in a given area; may wipe out; the entire population of cranes)
Having multiple populations on different migration routes a disease outbreak, habitat loss or bad weather in a given area
decreases may wipe out
the chance that a disease outbreak, habitat loss or bad weather in a given area may wipe out the entire population of cranes
the entire population of cranes