Texas Fauna Project

Northern Aplomado Falcon

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Dean Keddy-Hector, a biologist who worked at Texas Parks and Wildlife, and taught at the college level, was responsible for the application to list the aplomado falcon as endangered. Here he explains that the listing primarily drew on concerns that the bird's populations could crash due to eggshell thinning from DDT and DDE. In more recent years, worries have arisen from other long-lived chemicals found in fire retardants and rodenticides.