SUBTLETIES OF BEHAVIOUR
In addition to slight differences in shape, structure and plumage, many seemingly similar warbler species differ slightly in their behaviour. For example, Whitethroats are much less skulking and introverted than Lesser Whitethroats, which usually remain hidden, while the former readily perch in full view. Shyness is taken to extremes by grasshopper warblers, which creep around vegetation out of sight, and also birds such as Barred Warbler, which can stay in a single bush for hours, unseen! Other behaviour to look out for include tail dipping. For example, Chiffchaffs habitually dip their tails constantly, while the similar Willow Warbler tends to dip only on alighting. Some birds, notably Phylloscopus warblers, are fidgety and constantly active, while others such as the scarce Hippolais warblers are altogether more slow-mo and seemingly lethargic in their actions.
Barred Warblers are usually incredibly skulking, staying well within cover