delawarensis Ring-billed Gull

(last update: 10-03-2014 )

Keith Mueller
Amar Ayyash
Mars Muusse

Index ORG

ring projects

1cy June
1cy July
1cy Aug
1cy Sept
1cy Oct
1cy Nov
1cy Dec

2cy Jan
2cy Feb
2cy March
2cy April
2cy May
2cy June
2cy July
2cy Aug
2cy Sept
2cy Oct
2cy Nov
2cy Dec

3cy Jan
3cy Feb
3cy March
3cy April
3cy May
3cy June
3cy July
3cy Aug
3cy Sept
3cy Oct
3cy Nov
3cy Dec

adult Jan
adult Feb
adult March
adult April
adult May
adult June
adult July
adult Aug
adult Sept
adult Oct
adult Nov
adult Dec

Variation in Ring-billed Gull Tail Bands - Amar Ayyash / Anything Larus.

See Amar's blog.

Ring-billed Gulls show various tail band widths in their first cycle - some thin, others wide. Here's a collection of examples beginning with narrow bands and leading up to wider bands.

Amar: I've found that thin tail bands usually taper off and become thinner at the outer tail feathers (see the first bird pictured above), while wide tail bands typically become distally wider (see the last bird pictured above). Here, there is a variable amount of black that creeps up the outer tail feathers and may sometimes reach the bases of these outermost rectrices. This look is much different than that of birds with thinner bands. In short, the amount of variation is appreciable and may cause confusion for those not familiar with it...spread the word!