Figure 6b. Bald Eagle Christmas Bird Count Data. Iowa Mid-Winter Bald Eagle Survey Several thousand eagles spend their winters in Iowa, a significant portion of the lower 48 states’ population.
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Iowa Mid-Winter Bald Eagle Survey Several thousand eagles spend their winters in Iowa, a significant portion of the lower 48 states’ population.
The number of eagles admitted to wildlife rehabilitators is only a portion of the eagles dying each year. Band return rates have been used to estimate the probability of the public finding an animal and reporting it (Green, personal communication). The band return rate for bald eagles is 15%. Number of eagles admitted with abnormal lead levels / .15 = Estimate of Total Eagle Deaths due to Lead Ingestion.
On average, approximately 82 eagles are dying in Iowa each year due to lead ingestion.
After spending over 30 years on the Endangered/Threatened List, Bald Eagles are still listed as a species of Special Concern and as a Species of Greatest Conservation Need in Iowa