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We studied the intra- and interspecific responses to playback of pre-recorded calls by five tropical humid for est owl species at La Selva preserve in northeaster n Costa Rica fr om April to September 1995. Response to conspecific br oadcast calls differed among species (X2 = 24.4; df = 1; P < 0.001): V ermiculated Scr eechowls (Otus guatemalae) responded to 47.6 per cent of br oadcasts, followed by Crested Owls (Lophostrix cristata, 45 percent), Mottled Owls (Ciccaba virgata, 18.3 per cent), and Black-and-white Owls ( C. nigrolineata, 9 percent). Cr ested Owls (x = 16.37, sd = 2.6), Mottled Owls (x = 11.7, sd = 7.1), and Vermiculated Scr eech-owls (x = 10.9, sd = 0.9) responded to interspecific playback mor e than did Blackand- white Owls (x = 2.04, sd = 2) (H = 10.6; P = 0.01). Spectacled Owls (Pulsatrix perspicilata) did not r espond at all during our br oadcasting period. Both types of r esponse showed some monthly variation. Response to the calling of other owls also depended on ecological variables such as habitat selection, population density, and resource use. Our data suggest that the development of r elationships within the tr opical owl community at La Selva may have been mediated in part by intra- and interspecific calling. Inglés

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