Sibling competition selects nestlings to beg as quickly as possible when a stimulus in the nest entrance is presented. However, predation risk may select for nestlings to properly assess stimuli before begging, because nestlings that beg to erroneous stimuli may signal their position to a predator. The begging behavior of Coal Tit (Parus ater) and Great Tit (Parus major) nestlings to an artific...

In past work, the authors produced divergent patterns of courtship and communication in juvenile male cowbirds (Molothrus ater) by providing them with different social experiences during their 1st year. Here the authors determined whether these different social patterns could be transmitted to new generations of juvenile males. In Experiment 1, the authors exposed groups of juveniles to adult m...

A large, partly pedunculated mass on the scapular area of a wild-caught captive Brown-headed Cowbird (Molothrus ater) consisted of a multiloculated keratin cyst inhabited by a new species of harpirhynchid mite (Harpirhynchus quasimodo). The mass did not interfere with flight or behavior. This is the first record of such an infestation of cowbirds in Florida.

O objetivo deste relato é apresentar o resultado das atividades de Assistência Técnica e Extensão Rural (ATER) realizadas pelo Instituto Agronômico Pernambuco (IPA) no Assentamento Nascimento entre os anos 2012 2015, localizado município Belém do São Francisco-PE composto por 12 famílias agricultoras que, em sua integralidade, compõem a Associação dos Agricultores Familiares Nascimento. Em 2011...

The Latin language contains a number of synonymous terms in its basic color categories. The goal of this essay is to trace the diachronic trends of such terms; to discover which term, if any, is the favored term for a color category; and to determine whether it became established as such in sequence with the Universal Evolution (UE) model. I examine the frequencies of all potentially-basic colo...

IntroductionIntercropping contributes a significant role in sustainable agricultural system as it improves soil conservation, productivity and stability of yield makes better use production elements. However, the economic advantages dis sesame legume intercropping is not quantified.MethodsField experiment, consisted seven treatments, conducted 2016 2017 cropping seasons using randomized complet...