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Great Horned Owl Diet

This comprehensive study by Geoffrey H. Palmer explores the diet and behavior of Great Horned Owls, examining how their prey preferences vary over time. It analyzes factors affecting diet variation, including prey availability, breeding seasons, and environmental changes. Field observations from February to April 2008 included the collection of 44 pellets from various owl groups, revealing significant data on prey types like kangaroo rats and cotton rats. The implications of these findings highlight the importance of habitat management in supporting owl populations and their food sources.

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Great Horned Owl Diet

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  1. Great Horned Owl Diet Geoffrey H. Palmer

  2. Intro to Great Horned Owls

  3. Intro to Great Horned Owls • Classification

  4. Intro to Great Horned Owls • Classification • Distribution

  5. Intro to Great Horned Owls • Classification • Distribution • Morphology

  6. Intro to Great Horned Owls • Classification • Distribution • Morphology • Behavior & Diet

  7. Does diet vary over time?

  8. Why would diet vary over time?

  9. Why would diet vary over time? • Prey availability & vulnerability

  10. Why would diet vary over time? • Prey availability & vulnerability • Breeding season of owls

  11. How can I measure diet variation?

  12. How can I measure diet variation?

  13. Field Site

  14. Methods 19 Feb 2008 to 05 Apr 2008

  15. Results • 44 pellets • 46 individuals • 7 groups of small mammals

  16. Dipodomys – Kangaroo rats • 3 species • 2 individuals

  17. Reithrodontomys – Harvest mice • 3 species • 4 individuals

  18. Sigmodon – Cotton rats • 4 species • 4 individuals

  19. Neotoma - Woodrats • 1 species • 2 individuals

  20. Peromyscus – Deer mice • 4 species • 15 individuals

  21. Pocket Mice • 5 species • 17 individuals

  22. Importance • Las Cienegas

  23. Management Practices

  24. Management Practices Change in prey species: • Availability • Vulnerability

  25. Importance • Las Cienegas • Range wide

  26. Importance • Las Cienegas • Range wide • Other species

  27. Importance • Las Cienegas • Range wide • Other species

  28. Importance • Las Cienegas • Range wide • Other species

  29. Importance • Las Cienegas • Range wide • Other species

  30. Importance • Las Cienegas • Range wide • Other species

  31. Importance • Las Cienegas • Range wide • Other species

  32. Acknowledgements Dr. JodyLee Duek Jess Gwinn Nate Gwinn David Kahrs Sonja Smith

  33. ?Questions?

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