Reverse migration, where the genetic programming of young birds fails to work properly, can lead to rarities turning up as vagrants thousands of kilometres out of range.
Reverse migration , where the genetic programming of young birds fails to work properly , can lead to rarities turning up as vagrants thousands of kilometres out of range .
What is reverse migration?
What is reverse migration ?
where the genetic programming of young birds fails to work properly
where the genetic programming of young birds fails to work properly