What in the world is meant by HY, SY and ASY?
These are nothing more than acronyms or, shortened terms, for a quick way of expressing the age of the birds you’re dealing with and is determined by the plumage. Hatching Year, (birds born this year), Second Year, (birds born last year and still having adolescent plumage), and After Second Year, (birds born at least two years ago and have now attained their adult plumage). Other terms you’ll see a lot is SREH. (Starling Resistant Entrance Hole). This has to do with a new type of entrance holes used to help keep starlings out of housing. Another is S&S (Starlings & Sparrows). A short way to describe two of the martins worst enemies.
