| Gulls | Legring : one, coded. | Kelp Gull | Black (Niger) [N] | Three alpha-numeric code (3 letters/numbers). |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Black-headed Gull | Red [R] | Four alpha-numeric code (4 letters/numbers). | N |  |  | 
          
                  | Gulls | Legring : one, coded. | Black-headed Gull | Dark Blue [B] | Three alpha-numeric code (3 letters/numbers). |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | White [W] | Four alpha-numeric code (4 letters/numbers). | KJ or KR |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | Brown (Umber) [U] | Three alpha-numeric code (3 letters/numbers). |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | Orange [O] | Four alpha-numeric code (4 letters/numbers). | E |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | Silver/Grey [S] | Two alpha code (2 letters). |  |  | Tarsus right. | 
          
                  | Gulls | Legring : one, coded. | Great Black-backed Gull | Dark Green [G] | Four alpha-numeric code (4 letters/numbers). | X |  |  | 
          
                  | Gulls | Legrings : combination of one coded and uncoded rings. | Great Black-backed Gull |  |  |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | Red [R] | Four alpha-numeric code (4 letters/numbers). | U |  | Tarsus right. | 
          
                  | Gulls | Legring : one, coded. | Black-headed Gull | Black (Niger) [N] | Four alpha-numeric code (4 letters/numbers). | P |  |  | 
          
                  | Gulls | Legring : one, coded. | Mediterranean Gull | Red [R] | Four alpha-numeric code (4 letters/numbers). | J |  |  | 
          
                  | Gulls | Legring : one, coded. | Lesser Black-backed Gull | Red [R] | Two alpha-numeric code (2 letters/numbers). |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Great Black-backed Gull | Dark Green [G] | Three alpha-numeric code (3 letters/numbers). |  |  |  | 
          
                  | Gulls | Legring : one, coded. | Yellow-legged Gull | Dark Blue [B] | Four alpha-numeric code (4 letters/numbers). | E |  |  | 
          
                  | Gulls | Legring : one, coded. | Yellow-legged Gull | Dark Blue [B] | Four alpha-numeric code (4 letters/numbers). | M: |  |  | 
          
                  | Gulls | Legring : one, coded. | Eurasian Mew Gull | Yellow [Y] | Four alpha code (4 letters). | I |  |  | 
          
                  | Gulls | Legring : one, coded. | Yellow-legged Gull | Dark Green [G] | Four alpha code (4 letters). | P |  |  | 
          
                  | Gulls | Legring : one, coded. | Caspian Gull | Orange [O] | Four alpha-numeric code (4 letters/numbers). | N |  |  | 
          
                  | Gulls | Legring : one, coded. | Eurasian Mew Gull | White [W] | Four alpha-numeric code (4 letters/numbers). | A |  |  | 
          
                  | Gulls | Legring : one, coded. | Yellow-legged Gull | Dark Blue [B] | Four alpha-numeric code (4 letters/numbers). | G: |  |  | 
          
                  | Gulls | Legring : one, coded. | Great Black-backed Gull | Orange [O] | Four alpha-numeric code (4 letters/numbers). |  | M | Tarsus left. | 
          
                  | Gulls | Legring : one, coded. | Great Black-backed Gull | White [W] | Four alpha-numeric code (4 letters/numbers). | C |  |  | 
          
                  | Gulls | Legring : one, coded. | Yellow-legged Gull | Dark Green [G] | Four alpha-numeric code (4 letters/numbers). | Z |  | Tarsus right. | 
          
                  | Gulls | Legring : one, coded. | Caspian Gull | Yellow [Y] | Four alpha-numeric code (4 letters/numbers). | X |  |  |