Oviraptorid eggs are shaped like elongated ovals ("elongatoolithid") and resemble the eggs of ratite birds (such as ostriches) in texture and shell structure. In the nest, eggs are typically found in pairs and arranged in concentric circles of up to three layers, with complete clutches consisting of as many of 22 eggs in some species. The eggs of "Citipati" are the largest known definitive oviraptorid eggs, at 18 cm. In contrast, eggs associated with "Oviraptor" are only up to 14 cm long.