Sandwich Terns from central Texas:
1) An adult-type with more than the normal amount of yellow in the bill:
2) A first-winter from September 20, 2008 that has retained a significant amount of orange in the bill (or could this be a hybrid?):
Three juveniles with extensive orange in the bill:
3)
4)
5)
6) - here's a typical juvenile from the same time-period:
