birds, predation is regarded as the primary agent of selection on nest-site microhabitat preferences, but alternatives are … rarely considered. We tested the hypothesis that avian nest-site preferences are an adaptive response to fitness costs … imposed by variation in nest-site microclimate. We documented that Chestnut-collared Longspurs (Calcarius ornatus) strongly …

We investigated the role of kinship in intraspecific nest parasitism of wood ducks (Aix sponsa). Among waterfowl …, female philopatry creates the potential for female relatives to nest in proximity. Costs of intraspecific nest parasitism to … the parasite with the greatest number of young leaving the nest was 0.11 ± 0.03, which was greater than expected if eggs …

Among bird species in which males contribute to nest building, sexual selection has favored larger nests. I … investigated determinants of nest size in the barn swallow Hirundo rustica and how nest size changed during the period 1977 … contributed more to nest building than long-tailed males, signaling their future investment in food provisioning of offspring …

parental care by nest-guarding smallmouth bass (Micropterus dolomieu), we compared nest-guarding behavior and energy …, smallmouth bass were exposed to fewer and predominantly open-water predators and were less active in their nest defense. From … scuba and video observations, we documented that nest-guarding smallmouth bass chased predators (99% of which were round …