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Study carried out within the urban perimeter of Londrina, which is located in the North of the state of Parana. The objectives were the identification of urban species of bats and diurnal roosts used by them and the verification of the problems they can cause to the population. The fire brigade, the Autarquia Municipal do Ambiente de Londrina (Municipal Environment Autarchy of Londrina), the Biology Department of the Universidade Estadual de Londrina (State University of Londrina) and local residents helped spot the roosts. The collections were carried out in regular intervals between April 1998 and March 1999. By the end of them, 815 bats of 23 different species had been captured. Among these, 12 were found near or inside human constructions: Noctilio albiventris Desmarest, 1818; Artibeits lituratus (Olfers, 1818); Platyrrhinus lineatus (E. Geoffroy, 1810); Eptesicus brasiliensis Desmarest 1819; Lasiurus bore-alls (Muller 1776); Lasiurus ega (Gervais, 1856); Eumops glaucinus (Wagner, 1843); Molossus rufus (E. Geoffroy, 1805); Molossus molossus (Pallas, 1766); Nyctinomops laticaudatus (E. Geoffroy, 1805); Nyctinomops macrotis (Gray, 1840) e Tadarida brasiliensis (i. Geoffroy, 1824). Roost sites comprised expansion joints, roofs, attics and parks, among others. It can be concluded that bats are treated as undesirable animals by the population due to the lack of knowledge about the subject.