Treecreepers

Five species, and every one of them makes a living the same unusual way: working up a tree trunk in a spiral, head-first from the base, probing bark crevices with a thin, downcurved bill for insects and spiders, then flying down to the base of the next trunk to start again. Streaked brown-and-buff above and pale below, treecreepers are built to disappear against bark, and the climbing behaviour itself is often the giveaway before any plumage detail is visible.

All five Indian species are Himalayan and Northeast hill-forest specialists, generally quiet, easily overlooked among the mixed foraging flocks they often travel with, and separated from one another mostly by fine differences in underpart colour, back pattern and range rather than anything bold. A clean, sunlit portrait like the kind treecreepers reward with patience is genuinely useful for this group — poor light on a bark-coloured bird against bark is a common way to lose the shot entirely.