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Related Concept Videos

Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
Conservation of Declining Populations02:07

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Mate Choice01:20

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
Optimal Foraging00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Related Experiment Video

Updated: May 29, 2026

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern
04:10

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Published on: March 8, 2020

Perch exposure and predation risk: a comparative study in passerines.

Diana P Campos1, Laith A Bander, Aliz Raksi

  • 1Department of Ecology and Evolutionary Biology, University of California, 621 Young Drive South, Los Angeles, CA 90095-1606 USA.

Acta Ethologica
|August 30, 2011
PubMed
Summary

Birds balance singing and vigilance to reduce predation risk. Concealed birds sing more, while larger birds are more sensitive to predator exposure near forest edges.

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Area of Science:

  • Behavioral Ecology
  • Avian Biology
  • Predator-Prey Dynamics

Background:

  • Singing birds often perch in exposed locations for optimal signal transmission.
  • Conspicuous singing can increase predation risk, leading to a trade-off between singing performance and perch exposure.

Purpose of the Study:

  • To investigate the relationship between predation risk factors and singing/vigilance behavior in East African savanna passerines.
  • To determine how concealment, perch height, and distance to forest edge influence singing and vigilance.

Main Methods:

  • Studied 13 passerine species in an East African savanna.
  • Quantified predation risk using degree of concealment, perch height, and distance to forest edge.
  • Measured time allocated to singing and vigilance.

Main Results:

  • Concealed birds sang more and exhibited less vigilance.
  • Vigilance increased with distance from the forest edge; singing was unaffected.
  • Body size correlated with vigilance sensitivity to concealment and forest edge distance, but not singing.

Conclusions:

  • Birds adjust vigilance and singing behavior to mitigate predation risk.
  • Habitat concealment and proximity to forest edges are key factors influencing anti-predator strategies in singing birds.