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  1. Experimental Analysis of Nest-Site Choice and its Relationship to Nest Success in an Open-Cup–Nesting Passerine

    Nest placement presumably reflects selection for secure sites to minimize failure. Most tests of this hypothesis, however, have failed to support it. We used artificial nests (ARTs) to experimentally evaluate...

  2. The Breeding Biology of the Northern Pygmy Owl: Do the Smallest of the Small Have an Advantage?

    We explored the breeding biology of the Northern Pygmy-Owl (Glaucidium gnoma) from 2007 to 2009 in a forested reserve in Portland, Oregon. Large body size is often assumed to give animals reproductive...

  3. Is reproduction by Tree Swallows (Tachycineta bicolor) Cost-Free?

    We manipulated brood sizes of Tree Swallows (Tachycineta bicolor) in 1996 and 1997 to test for the existence of intra- and intergenerational costs of reproduction. Modal clutch size was six eggs, but...

  4. Nest Success and Nesting Habits of Eastern Kingbirds and Other Flycatchers

    Patterns of nest placement and its relationship to nest success in the Eastern Kingbird (Tyrannus tyrannus) were studied in populations breeding in New York and Kansas. Data were augmented with information on...

  5. Brood Parasitism of Eastern Kingbirds by Brown-Headed Cowbirds

    Understanding why brood parasites lay eggs in the nests of hosts that reject eggs is hampered by insuf-ficient data on the frequency with which parasites lay in rejecter nests, and by ignorance of which...

  6. Residential Edges as Ecological Traps: Postfledgling Survival of a Ground-Nesting Passerine in a Forested Urban Park

    Substantial offspring mortality can occur during the postfledging period of birds, but few postfledging survival studies have been conducted within the context of habitat suitability. We conducted a 2-year...

  7. Body Size and Condition, Timing of Breeding, and Aspects of Egg Production in Eastern Kingbirds

    Variation in timing of breeding in Eastern Kingbirds (Tyrannus tyrannus) was correlated only weakly with external morphological characters, but was correlated positively and significantly with estimates of body...

  8. The Impact of Weather on Kingbird Foraging Behavior

    Foraging data on Eastern Kingbirds (Tyrannus tyrannus) were collected during the early breeding season in eastern Kansas to test the hypothesis that foraging rate and other aspects of foraging behavior vary...

  9. Body Size, Nest Predation, and Reproductive Patterns in Brown Thrashers and Other Mimids

    We describe the breeding biology of Brown Thrashers (Toxostoma rufum) in Kansas, and combine this with data from other temperate-zone breeding Mimidae to characterize reproductive patterns in this group. Brown...

  10. Clutch Size in the Eastern Kingbird: Factors Affecting Nestling Survival

    Observational and experimental procedures were used to evaluate the potential importance of brood size and weather on the evolution of clutch size in the Eastern Kingbird. Modal clutch size was three eggs, yet...

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