Age codes include HY (hatching year), indicating a bird in the calendar year of its hatching; SY (second year), indicating a bird in its second calendar year (HY/SY indicates a bird in its first plumage cycle, being HY until 31 Dec and SY after 1 Jan); TY (third year), indicating a bird in its third calendar year; AHY (after-hatching year), ...
Leif erickson and the vikings were in fact the first to discover and settle on what is now called the united states of america. Christopher Columbus is given credit for discovering the New World, but was he really the first person to step foot in this new land.
According to research published in 2012, the first footprints on land were the footprints of euthycarcinoids. Euthycarcinoids are arthropods that lived approximately 500 million years ago. Scientists were uncertain of the first animal that set foot on land and suspected amphibians or centipedes for some time.