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    Larger bird species experience lower daily nest predation rates than smaller species, contrary to expectations. This finding suggests behavioral adaptations in larger birds may influence body size evolution by reducing predation exposure.

    Keywords:
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    Area of Science:

    • Evolutionary Biology
    • Ornithology
    • Ecology

    Background:

    • Body size evolution often emphasizes advantages of larger size, overlooking potential costs.
    • Extended development periods in larger species are hypothesized to increase predation risk, selecting against larger body size.
    • In birds, nest predation is a primary cause of offspring mortality, with larger nests potentially being more detectable by predators.

    Purpose of the Study:

    • To investigate the relationship between body size and daily nest predation rates in diverse passerine birds globally.
    • To determine if larger bird species face higher predation risks due to their size and associated nest characteristics.

    Main Methods:

    • Analyzed nest predation rates across diverse passerine bird species worldwide.
    • Compared daily nest predation rates between larger and smaller species, considering latitudinal variations.
    • Assessed nest protection strategies and predator types encountered by different-sized species.

    Main Results:

    • Contrary to predictions, larger passerine species exhibited lower daily nest predation rates than smaller species.
    • This pattern remained consistent across different latitudes and did not correlate with nest protection or location.
    • Larger species were observed to confront a broader range of predator sizes, potentially reducing nest predation.

    Conclusions:

    • Behavioral adaptations, such as attacking a wider array of predators, may mitigate predation risks for larger bird species.
    • Lower daily nest predation rates for larger species result in slightly lower overall predation over the developmental period.
    • These findings underscore the role of behavior in modifying selection pressures and have significant implications for understanding body size evolution.