Birds readily recognized on migration or over-winter in the south may look quite different on northern nesting grounds.
(Birds; readily recognized; on migration or over-winter in the south) (Birds readily recognized on migration or over-winter in the south; may look; quite different on northern nesting grounds)
Birds Birds readily recognized on migration or over-winter in the south
readily recognized may look
on migration or over-winter in the south
quite different on northern nesting grounds