The study reveals that since 1942 spring migration of whooping cranes occurs as many as 22 days earlier in spring and about 21 days later in fall.
This content is restricted to subscribers of OutdoorNews.com. If you are already an OutdoorNews.com subscriber, you can log in here. If you are not and would like to read this and all the other great content OutdoorNews.com has to offer, click here.


