Grant Sizemore

Director of Invasive Species Programs

Originally from Ohio, Grant grew up fascinated by nature and enjoying the outdoors. He earned degrees in Zoology and Environmental Science from Miami University and an MS in Wildlife Ecology and Conservation from the University of Florida. Prior to joining ABC, Grant has worked toward wildlife conservation through policy, outreach, education, and years of wildlife research. Outside of work, Grant enjoys hiking, birding, fishing, and taking care of his (indoor) cat.

A bright blue Cerulean Warbler perched on a branch of rain covered leaves in soft overcast light. Photo by Ray Hennessy

For many birds, forests are nest sites and nurseries, territories, and rest stops. They provide the abundant resources that help birds survive and raise their young successfully. They do much of the same for people. Forests perform many essential ecosystem services that go unnoticed, like absorb...

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Dec 11, 2025

Forestry

Much about Swallow-tailed Kite migration is a mystery, but tracking technology is shedding light on the timing and routes of their movements, allowing researchers and conservationists to keep up with individual kites when they are on the wing. In 2019, American Bird Conservancy (ABC) and Internation...

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Dec 11, 2025

Forestry

Swallow-tailed Kite sitting in tree. Photo by Larry Master, masterimages.org

A giant paper company and its mill might seem antithetical to the cause of bird conservation. Yet today, International Paper (IP) plays a growing role in this arena. It belongs to the Sustainable Forestry Initiative (SFI), and the wood it buys from landowners and forestry companies must meet sustain...

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Dec 11, 2025

Bird Conservation Magazine

A forested landscape with rolling hills and clouds.

Located along the equator, tropical forests are the most biodiverse habitats in the world. The relative stability of these lush habitats, where temperatures rarely fluctuate and rainfall remains steady or cyclical, creates the perfect conditions for life to flourish. And does it ever! Despite coveri...

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Nov 21, 2025

Climate Change