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Seasonal changes of hippocampus volume in parasitic cowbirds
Risk sensitivity in starlings: variability in food amount and food delay
A model of choice based on an information-processing theory for temporal memory that accounts for the different effects of variability in delay and in amount but cannot explain the effects of intake rate is presented.
Species and sex differences in hippocampus size in parasitic and non‐parasitic cowbirds
To test the hypothesis that selection for spatial abilities which require birds to locate and to return accurately to host nests has produced an enlarged hippocampus in brood parasites, three species…
Effect of Group Size on Individual and Collective Vigilance in Greater Rheas
The results indicate that rheas foraging in large groups would not receive the benefit of an increase in collective vigilance, although they could still benefit from a reduction of predation risk by the dilution effect.
EFFECTS OF CLUTCH SIZE AND TIMING OF BREEDING ON REPRODUCTIVE SUCCESS OF GREATER RHEAS
It is suggested that the proportion of males that are able to attempt breeding is limited by energetic constraints and inversely correlated with rainfall during the breeding season and positively correlated with time of thebreeding season.
Lethal and Sublethal Effects of Botfly (Philornis seguyi) Parasitism on House Wren Nestlings
The results reveal that P. seguyi has lethal and sublethal effects on House Wren nestlings and that the intensity of parasitism, age of nestlings at the time they are infested, and sequence of hatching are important factors that influence the survival of parasitized nestlings.
The wages of violence: mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds
EARLY INFESTATION BY BOT FLIES (PHILORNIS SEGUYI) DECREASES CHICK SURVIVAL AND NESTING SUCCESS IN CHALK-BROWED MOCKINGBIRDS (MIMUS SATURNINUS)
The results show that an intermediate prevalence of bot fly parasitism produces an important decrease in the reproductive success of Chalk-browed Mockingbirds and suggest that bot flies may play an important role as selective agents in the evolution of host life-history strategies.
Chilean Swallows (Tachycineta meyeni) Adjust the Number of Feathers Added to the Nest with Time of Breeding
Tachycineta swallows nest in secondary cavities and build nests made of a mat of dry grasses with a nest cup lined with feathers, and Chilean Swallows make temporal adjustments to the number of feathers added to the nest, which may help maintain reproductive success throughout the breeding season.