Insects found in birds’ nests from Argentina: Anumbius annumbi (Vieillot, 1817) (Aves: Furnariidae) Author Turienzo, Paola Author Iorio, Osvaldo Di text Zootaxa 2008 1871 1 55 journal article 10.5281/zenodo.183966 531f77bf-5599-45cf-8024-aec7cf4c96c3 1175-5326 183966 Cycloneda ancoralis (Germar) Cycloneda ancoralis is a very common species widely distributed across Argentina ( Bosq 1952 ; Viana & Williner 1974 ). In a recent revision of Brazilian species of Cycloneda , its distribution includes Bolivia (Beni), Chile , Brazil (Rio Grande do Sul), Paraguay (Asunción), Argentina [(Buenos Aires (La Plata), Córdoba (Sauce de los Quevedos), La Pampa (Santa Rosa), Tucumán, Mendoza, Santa Fé (Rosario)], and Uruguay (Montevideo) (Araujo-Siqueira & de Almeida 2006 ). The species is an excellent biological control agent against aphids, especially Toxoptera graminum Rondani ( Bosq 1952 ; Viana & Williner 1974 ). During the winter the adults seek refuge, forming large colonies and using them as shelters under the bark of trees of Eucalyptus and “chañar” [ Geoffroea decorticans (Gillies ex Hook. & Arn.) Burkart ], in parrots nests [ Myiopsitta monachus cotorra (Vieillot, 1817) ], or under stones in hilly areas ( Viana & Williner 1978 ). The same hibernating behavior can be found in nests of A. annumbi ( Table 2 ), but never under ritidomes of Eucalyptus ( Table 3 ).