Distinctive-looking small bird found in riverside or lakeside vegetation such as reeds; generally avoids the densest stands. Buffy-brown overall with a dark head; Central Asian birds average paler than Iranian birds. Sexes are similar, but females are lighter-colored and less contrastingly marked. The ‘caspia’ form of Eurasian Penduline-Tit can be similar, but Black-headed has an entirely dark head instead of a dark mask. Like other penduline-tits, builds a hanging pouch nest, which in this species is typically woven between reeds.