Coderings

Since 2019 Gull-billed terns were tagged using single-coloured rings and contrasting letter-number-combinations as follows:

2019: Lime-Green with black inscription, 2 digits, single leading letter followed by a single number, like A4, C1, E0, E7

2020: Dark-green with white inscription, 3 digits, single leading letter "X" followed by 2 numbers, like X01, X22, X30.

2021: White with black inscription, 3 digits, single leading letter followed by 2 numbers, starting with R, like R00, R23, R55

Codering 2019

 

Codering 2020