Many putative examples of coevolution do not stand up to critical analysis. A rigorous
definition of coevolution requires that a trait in one species has evolved in response to a trait …

In recent years, problems associated with the evolution of clutch size have evoked continued
interest. Although it can claim to be one of the oldest topics in life history theory, a variety of …

Birds show bewildering diversity in their life histories, mating systems and risk of extinction.
Why do albatrosses delay reproduction for the first 12 years of their life while zebra finches …

Socioecology has convincingly explained much of the diversity of animal social systems. It
has done so by demonstrating that the ecological consequences of particular social systems …

In The Black-Tailed Prairie Dog, John L. Hoogland draws on sixteen years of research at
Wind Cave National Park, South Dakota, in the United States to provide this account of …

Organisms compete for various resources in the course of sexual reproduction. First, there is
intrasexual competition for obtaining mates. Then, there is the need to exclude reproductive …

Among vertebrates, fish show by far the greatest variability of alternative reproductive tactics
(ARTs). Usually, males attempting to monopolize access to females or fertilizations are …

(1) The nests (n= 711) of twenty-four species of passerine birds were parasitized
experimentally with model cuckoo eggs.(2) Among current favourite hosts, species for which …

Parentage is the proportion of juveniles in a brood that are offspring of potential care givers.
We analyzed how reductions in parentage affect the evolution of parental behavior using a …

This paper presents a list, compiled from the literature, of bird species in which intraspecific
nest parasitism (INP) occurs. INP was reported in 234 species: one Struthioniformes, two …