1st winter/summer

Vega Gull
  Larus vegae  
Mar. 25th 2011 Tokyo Imperial Palace Japan

This is a breached, whitish Vega Gull in March that resembles Mongolian Gull from a distance.

Mongolian gull in January (left) and breached Vega Gull in March (right) 
Note the longish overall structure and narrow tail band of the Mongolian Gull. Most Vega Gulls in January look much darker and browner.