WILD 3580 1st Edition Lecture 34 Outline of Last Lecture I Why do birds sing II Learning to sing III Non vocal sounds Outline of Current Lecture I Migration Current Lecture I Migration Periodic two way movement o Bird migration North and south movements from winter to summer Some birds do shorter migrations in east to west Mostly waterfowl birds of prey ect Neotropical migrants birds breed in North America and migrate to the south in the winter Most birds migrate at night o Why Disadvantages 1 High mortality 2 High energetic cost 3 Loss of territory Advantages 1 Avoid times of food shortage 2 Avoid extreme climates 3 Reduced competition a Interspecific with other species for nesting space b Intraspecific factors within the species o How Migration is cued by photoperiod day length Predictable and reliable Hormonal physiological response These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Hyperphagia increased rate of feeding Preparing for migration through energy preserves Zugunruhe nocturnal migratory restlessness The proper distance and direction is innate Innate ability is modified by experience How do they find their way Direction finding mechanisms 1 Sun compass some animals can determine direction by the position of the sun 2 Celestial navigation navigate through stars a Research by Stephen Emlen using Indigo Buntings b Cue on constellations near the North Star 3 Magnetic field orientation geomagnetism 4 Visual cues ex Water courses mountain ranges a More learned than innate 5 Smell not as much of a component in birds
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