Combination of two c-rings (on right leg) and metal ring (on left leg).
note 1 : used colours in a two cr-combination are : dark-green, orange, black, white, yellow, red, violet.
note 2 : during 2014 12 birds were ringed.
note 3 :
Orange ring with a black two alpha-code (on one leg) and metal ring (on the other leg).
note 1 : this is a local project (Viennese Kestrel Project) and only used in 2015.
note 2 : only nestlings are colour ringed in this population.
White ring with a black three numeric code (on left tarsus) and metal ring (on right leg).
note 1 : used numbers are : 0 - 9.
note 2 : birds ringed since 1987.
White ring with a black three alpha code (on left tarsus) and metal ring (on right leg).
note 1 : used letters are: A, C, F, H, J, L, M, N, P, R, T, U, V, W and X.
Orange ring with a black three numeric code (on left tarsus) and metal ring (on right leg).
note 2 : birds ringed since 2015.
Orange ring with a black three alpha code (on left tarsus) and metal ring (on right leg).
Green ring with a white three numeric code (on left tarsus) and metal ring (on right leg).
note 2 : birds ringed since 2007.
Green ring with a white three alpha code (on left tarsus) and metal ring (on right leg).
White ring with a black three alpha-numeric code (on left tarsus) and metal ring (on right tarsus). * number - number - letter 'R'
note 1 : birds ringed in SW Romania.
note 2 :
Black ring with a white three alpha-numeric code (on left tarsus) and metal ring (on right tarsus). * letter 'R' - number - number * letter 'R' - letter - number
note 1 : birds ringed in NW Romania.