International Owl Center
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  • Home
  • Programs and Events
    • Owl Prowls
    • Special programs
    • Virtual Owl Expert Speaker Series
    • International Owl Awareness Day
    • Virtual Programs
    • Festival of Owls
    • School and Group Programs
    • Lunch for the Owls
    • Ukrainian Art for Ukrainian Kids
  • DIY Activities
    • Owl Crafts
    • Cat Toys
    • Dissect Owl Pellets
    • Build a Nest Box
    • Coloring Pages
    • Puzzles
  • Future Plans
  • Our Research
    • Research Basics
    • Live Cam
    • Hear Individual Owls
    • Types of Great Horned Owl Vocalizations
    • Great Horned Owl Growth Chart
    • Background Info >
      • History of Rusty and Iris
      • What happened to Rusty and Iris's young?
      • Owl Glossary
      • Great Horned Owl Facts
    • Blog
  • I found an injured owl!
    • What do I do?
    • Find a Rehabber
  • Owls and You
    • Joggers and Owls
    • Live an Owl-Friendly Life
    • Respectful Owl Photography and Observation
    • Owls as Pets
    • Owls Attacking Pets
    • Owl Myths and FAQ
  • Visit Us / About Us
    • Visit
    • Our Owls
    • Staff and Board
    • History
  • Support Us
    • Memberships
    • Donate
    • Founder's Circle
    • Other Ways to Help
  • Educator Resources
    • Education Methods
    • Assessing Impact
    • Regulations
    • Workshop Summary
    • Resources
    • Links
  • Owl Conferences
    • Future Conferences
    • Past Conferences
    • Conference Planning
    • E-Newsletter
  • Kids' Art Contest
  • Store
International Owl Center

Great Horned Owl Growth Chart

We have compiled a document showing various photos of known age and gender owls to help rehabilitators and banders to more accurately age young owls. We have also included weights of our owls at known ages. Click the link below to download the full file.
Great Horned Owl Growth Chart
File Size: 2960 kb
File Type: pdf
Download File

Graph of captive-reared great horned owl weights at known ages.

International Owl Center
126 E Cedar St.
Houston, MN 55943

(507) 896-OWLS (6957)
[email protected]
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501(c)(3) organization
​EIN #45-5503365
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