Great Horned Owls: Mating, Nesting, & Owlets

Experience Level: Beginner

Join us for Great Horned Owls: Mating, Nesting, & Owlets on Saturday, May 24 from 12-1:30 p.m. in the Mansion Library.

Instructor Mark Glenshaw will share what he has been able to observe and document of mating, nest selection, feeding of the owlets, fledging and gradual maturation and eventual dispersal of the owlets. He will also share many of his photos and videos to illustrate the fascinating behaviors of these beautiful owls.

$25/person. Registration will close May 17 or when capacity is reached. All sales are final.

Learn more about the space where your course will take place . If you will need disability-related accommodations to participate, please email [email protected].

By attending, you consent to your image being used in Allerton marketing, social media and publications. Please alert the photographer or videographer if you do not want your image taken.

About the Instructor

Mark Glenshaw is an award-winning naturalist from St. Louis, Missouri who observes, documents and performs outreach regarding the wild Great Horned Owls that live in Forest Park — a large urban park in St. Louis. He was studied these owls six to seven nights per week since December of 2005, documenting their behavior in both photos and video.

Glenshaw also received the 2025 Outstanding Educator Award from the St. Louis Audubon Society.

His outreach includes an average of 70 owl prowls and 50 presentations per year, including presentations to various Audubon Society chapters and six presentations for the Smithsonian Institution.

In 2006 Glenshaw was awarded the Citizen Science Award by the Academy of Science of St. Louis. He is also a Certified Interpretive Guide, a certified Missouri Master Naturalist and a volunteer for Forest Park Forever.

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