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There is increasing evidence that the genetic architecture of exploration behavior includes the dopamine receptor D4 gene (DRD4… Expand Using the behavior of others in guiding one's own behavior is a common strategy in animals. The prevailing theory predicts that… Expand Understanding the evolution of a trait requires analysing its genetic basis. Many studies have therefore estimated heritability… Expand Resumen. – Usurpacion de nidos por el Mosquerito Pirata (Legatus leucophaius ) in el suroestede Costa Rica. – El Mosquerito… Expand Tyrant flycatchers comprise the largest group of passerine birds of the Neotropical region but their retinal organization is… Expand This paper aims at partitioning genetic and environmental contribution to the phenotypic variance in nestling immune function… Expand Buff-breasted Sandpiper (Tryngites subruficollis) is a species of high conservation concern within the United States, Canada… Expand Although immune function usually declines with age in humans and captive animals, little is known about whether immune function… Expand Between 9 and 19 November 1999 we conducted ornithological surveys at Gunung [= Mount] Ambang, an 8,638 hectare nature reserve… Expand -The causes of intratropical migration in the Yellow-green Vireo and Piratic Flycatcher are discussed. Data on migration arrival… Expand