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Aging Passerines using Molt
limits
American Robin
ASY Male-no molt limit-broad feathers with dark shafts
American RobinSY Male-molt limit-narrow, “weaker” primary coverts
SY Female-molt limit-narrow, “weaker” primary coverts
Broad primary coverts with dark
shafts.
ASY
Narrow, weak primary coverts
with brown shafts.
Broad greater coverts
With no molt limit.
Molt limit within greater coverts.
SY
Replaced coverts
Retained coverts
Yellow-rumped Warbler
ASY Male-1 molt limit Alt plumage (greater coverts)
Yellow-rumped Warbler
SY Male-2 molt limit Alt plumage (greater coverts and retained first year feathers)
Indigo BuntingThe Test
Age?
No molt limit
ASYHow do you know?
Age?
Clear molt limit
SYHow do you know?
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