Resumen en Inglés:

The physical parameters of vocalizations in Hyla rubicundula are analyzed in the topotypical population and some requirements for this kind of analysis are discussed.

Resumen en Inglés:

Antthrushes (Formicarius, Chamaeza) sometimes walk around swarms of army ants and capture ground prey, but do not follow ants regularly. Among antpittas, only fast-leaping Pittasoma michleri and P. rufopileatum regularly follow ants. Gnateaters (Conopophaga) follow ants little. All these ground-foraging genera are poorly adapted for rapid flying, and failure to follow ants is perhaps due to inability to evade predators or out fly competitors near groups of birds attracted by ants.

Resumen en Inglés:

The fruit bats Carollia perspicillata and Sturnira tildae (Phyllostomidae) were observed feeding on ripe fruits of Solanaceous plants, Solanum grandiflorum and S. asperum, in the region of Manaus, Amazonas, Brazil. These observations were made between the end of July and the beginning of August, 1978, 1979 and 1981. S. grandiflorum and S. asperum are very common plants in open spaces and paths in the forest. Features of these plant species relevant to dispersal are described. Observations of the feding behavior of bats on ripe fruits showed that these plant species can be considered chirop-terochorous, fitting well within the bat-fruit syndrome. Carollia perspicillata relevant to dispersal are described. Observations of the feeding behavior of Solanum grandiflorum and S. asperum in the Manaus region.