There are 26 extant flycatchers in the family of Muscicapidae. This article describes the few commonly seen brown coloured flycatchers during winter and gives tips on how to identify them based on their morphology.
Image: Dillen Ng, Francis Yap, Keita Sin, Clarice Yan.
https://singaporebirds.com/2022/01/15/fly101-identifying-little-brown-jobs-of-the-genus-muscicapa-in-singapore/
