Obligate avian brood parasites do not provide direct care to their young but can indirectly increase their offspring's success in host nests. One way in which parasitic cowbirds (Molothrus sp.) could achieve this is through ...

Abstract: Shiny cowbirds (Molothrus bonariensis) are generalist brood parasites that use hosts varying in body and egg size. On the contrary, screaming cowbirds (M. rufoaxillaris), which are larger than shiny cowbirds, are ...

Interspecific brood parasites, like the shiny cowbird (Molothrus bonariensis), lay eggs in nests of other species. Shiny cowbird females peck and puncture eggs when they parasitize host nests. This behavior increases the ...

Despite the costs to avian parents of rearing brood parasitic offspring, many species do not reject foreign eggs from their nests.We show that where multiple parasitism occurs, rejection itself can be costly, by increasing ...

Las aves parasitas usualmente remueven o pican los huevos de sus hospedadores. Se han propuesto varias hipótesis para explicar la función de este comportamiento. El remover o picar los huevos del hospedador podría mejorar ...

For many hosts of brood-parasitic birds, their frontline of defence is to mob adult parasites that approach the nest. Mobbing is commonly interpreted as an adaptation to prevent the parasite from laying, although to date ...

Obligate brood parasitic birds, such as cowbirds, evade parental care duties by laying their eggs in the nests of other species. Cowbirds are assumed to avoid laying repeatedly in the same nest so as to prevent intrabrood ...

Nest-site selection and nest defense are strategies for reducing the costs of brood parasitism and nest predation, two selective forces that can influence avian nesting success and fitness. During 2001-2002, we analyzed ...

The South American fruit fly Anastrepha fraterculus (Wiedemann) (Diptera Tephritidae) was grown in the laboratory on two different table grape cultivars, 'Italia' (Vitis vinifera L.) and 'Niagara Rosada' (Vitis labrusca ...

The South American fruit fly Anastrepha fraterculus (Wiedemann) (Diptera Tephritidae) was grown in the laboratory on two different table grape cultivars, 'Italia' (Vitis vinifera L.) and 'Niagara Rosada' (Vitis labrusca ...