15 



Subterminal - usually refers to color patterning, in the area immediately 

 adjacent to the tip. The dark colorations in Figure 15 are 

 referred to as "subterminal bands". 



Figure 15. Subterminal bands. 



SU8-T6Rfv\iNAL BANDS 



Tertials - those flight feathers attached to wing bones extending from 

 the shoulder to the elbow joint. These are also considered to be 

 the several innermost secondaries (see Fig. 8). In some groups 

 (ducks, shorebirds and terns) the tertials may be very long and 

 pointed compared to the remaining (outer) secondaries. 



Undenting - the under surface of the wing; the wing surface that is 

 facing downward in flight or is against the body when the wing 

 is folded (Fig. 8). 



Upperwing - the upper surface of the wing; the wing surface that is 

 facing upward in flight or is outermost when the wing is folded 

 (Fig. 8). 



Windows - the large white spots within the black area of a gull's wing 

 tip (Fig. 16). 



Figure l6. "Windows" in gull primary feathers. 



