Indirect genetic effects (IGEs) are environmental influences on the phenotype of one
individual that are due to the expression of genes in a different, conspecific, individual …

Fluctuating asymmetry consists of random deviations from perfect symmetry in populations
of organisms. It is a measure of developmental noise, which reflects a population's average …

Why does nature love symmetry? In Asymmetry, Developmental Stability and Evolution, M--
oslash--; ller and Swaddle analyse the evolutionary implications of symmetry. They advance …

The first comprehensive review of all aspects of the biology of moult, drawing information
from across the literature and in all birds, from penguins to passerines. Feathers are …

In this paper we review the existing methods of quantifying avian wingtip shape, and
compare their efficiency at detecting morphological adaptations to migration. We use …

In Chance, Development, and Aging, two leading biological gerontologists review and
evaluate all of the available data to elucidate the respective roles played by genes and …

Important biological concepts typically have many definitions. Body condition is no
exception; it is a multi-level phenomenon that can be defined either conceptually or …

Avian plumage colors have emerged recently as model systems for investigating the types of
information that can be signaled by showy sexual displays in animals. In many species, the …

Avian plumage has long been used to test theories of sexual selection, with humans
assessing the colors. However, many birds see in the ultraviolet (< 400 nm), to which …

Researchers with diverse interests in topics ranging from the formation of dominance
hierarchies and social intelligence to animal personalities have predicted specific, and often …