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Abstract ∙ Age is one the most important parameters in avian biology, since life‐history strategies and population dynamics can… Expand When vocalizations transmit throughout the environment, attenuation and degradation may change the information of the signal; the… Expand There are relatively few quantitative descriptive studies of the vocalisations and vocal behaviour of tropical bird species, in… Expand Summary The aim of the present study was to investigate the light and electron microscopic structure of the tongue in White-eared… Expand Variations in the quality or quantity of a food source determines if an animal takes the risk of spending energy searching for or… Expand In nature hummingbirds face floral resources whose availability, quality and quantity can vary spatially and tempo- rally. Thus… Expand A survey on mite fauna of bird nests was carried out in Tehran, Golestan and Sistan & Baluchestan provinces in 2008. A total of… Expand The global climatic change could cause, in some places, appearance of meteorological phenomena considered rare. If we understand… Expand Testosterone promotes aggressive behaviour in male vertebrates during the breeding season, but the importance of testosterone in… Expand