BTO research has used information collected by bird ringers to investigate large-scale differences and flexibility in the timing of feather moult across 15 passerine species that breed in the UK. Different moult strategies were found between migrant and resident species, alongside within-species regional variation in moulting schedules.

Click here to read the rest of the article.: Flexibility in the timing of post-breeding moult in passerines in the UK | BTO – British Trust for Ornithology