The oft-cited quote by Dhabzhansky above reflects the importance of applying an
evolutionary approach to the study of biological questions. Although this almost certainly …

Physiological Adaptations for Breeding in Birds is the most current and comprehensive
account of research on avian reproduction. It develops two unique themes: the consideration …

Parasites can have detrimental effects on host fitness, and infection typically results in the
stimulation of the immune system. While defending against infection, the immune system …

Strategies developed by organisms to maximize foraging efficiency have a strong influence
on fitness. The way in which the range of food resources is exploited has served to classify …

The effects of supplementation of 10 mg/kg (i) apoester,(ii) canthaxanthin,(iii) 3% clover
extract,(iv) paprika oleoresin and (v) aztec marigold extract pigments to a wheat-based non …

Nestling is a defenceless stage in the life of birds in several ways. For instance, the
possibilities to escape infection and infestation by several parasitic diseases are greatly …

Most of our understanding of the function of colored traits displayed by birds and the
mechanisms that produce or maintain them comes from studies on adults. However, colored …

Up to 80% of all bird species are socially monogamous. Divorce (switching partners) or pair
disruption (due to the death of a partner) has been associated with decreased reproductive …

Mothers can adjust the phenotype of their offspring to the local environment through a
modification of their egg investment and/or nestling provisioning. However, offspring health …

Success in sibling competition is one of the main factors determining individual body
condition in the early stages of life and consequently offspring survival and fitness. In birds …