They make woven bag nests in trees. Most eat a mixed diet which includes insects. There are 9 species worldwide and 1 species which occurs in Iraq. Order: PasseriformesFamily: Paridae  The Paridae are mainly small stocky woodland species with short stout bills. Some have crests. They are adaptable birds, with a mixed diet including seeds and insects. There are 59 species worldwide and 3 species which occur in Iraq. Order: PasseriformesFamily: Sittidae  Nuthatches are small woodland birds. They have the unusual ability to climb down trees head first, unlike other birds which can only go upwards. Nuthatches have big heads, short tails and powerful bills and feet. There are 24 species worldwide and 3 species which occur in Iraq. Order: PasseriformesFamily: Tichodromidae  The wallcreeper is a small bird related to the nuthatch family, which has stunning crimson, grey and black plumage. Order: PasseriformesFamily: Remizidae  The penduline tits are a group of small passerine birds related to the true tits. They are insectivores. There are 13 species worldwide and 1 species which occurs in Iraq. Order: PasseriformesFamily: Oriolidae  The Old World orioles are colourful passerine birds. They are not related to the New World orioles. There are 29 species worldwide and 1 species which occurs in Iraq. Order: PasseriformesFamily: Laniidae  Shrikes are passerine birds known for their habit of catching other birds and small animals and impaling the uneaten portions of their bodies on thorns. A typical shrike's beak is hooked, like a bird of prey. Order: PasseriformesFamily: Corvidae  The family Corvidae includes crows, ravens, jays, choughs, magpies, treepies, nutcrackers and ground jays. Corvids are above average in size among the Passeriformes, and some of the larger species show high levels of intelligence. There are 120 species worldwide and 10 species which occur in Iraq. Order: PasseriformesFamily: Sturnidae  Starlings are small to medium-sized passerine birds. Their flight is strong and direct and they are very gregarious. Their preferred habitat is fairly open country. They eat insects and fruit. Plumage is typically dark with a metallic sheen. There are 125 species worldwide and 3 species which occur in Iraq.