A bit confused by the Spreadsheet Ben.

Your link shows there are 50 separate spread sheets, but whichever sheet number I click on it shows Sheet No 1?

Later on, to see if a bird has been played, it would be almost impossible to search through 50 sheets.

Why not put all the sheets into one Workbook. At least you can do a single search that way.

However, as only two columns are used, perhaps have Colums A & B from 1-99 Columns D & E 100 – 199 Columns F & G 200-299??

Just thoughts