Feather mass-to-length ratio

Age is associated with feather mass-to-length ratio in A. sechellensis.

“We found that feather mass-to-length ratio increased with age (indicating improving quality with age)”

Animalswithin individuals in a natural populationfeather

Inconsistent findings of ageing across different feather-quality indices in a wild passerine

Preprint·28 May 2026