|Hatch Year, all feathers one age (uniform molt pattern)|
|Second Year, outer primaries and inner (closest to body) secondaries have been replaced,the new feathers are darker(dark chocolate) and of higher quality then the old, |
retained (milk chocolate) feathers.
|After Second Year, (over 2 years old) has three generations of feathers|
fresh (dark chocolate), old (milk chocolate) and very old (old milk chocolate!)
|Notice the difference in porphyrin glow? As the feather ages, the pigment ages too;|
the older feathers don't glow as brightly as the fresh feathers. How old is this bird?