Once in their bloodstreams, DDT caused females to produce eggs with shells too thin to protect the embryo. Dec. 25, 2006. Updated June 2007. "Bald Eagle Leaves Endangered Species List." ">1940: Congress passes the Bald Eagle Protection Act. (Aug. 20, 2008) http://www.fws.gov/news/NewsReleases/showNews.cfm?newsId=A4C4116B-F819-28C1-B8DCE55F7D9C5976, Roach, John. The bald eagle is also protected under the Bald and Golden Eagle Act as well as the Migratory Bird Treaty Act. Fact Check: What Power Does the President Really Have Over State Governors? We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. (Aug. 11, 2008)http://www.washingtonpost.com/wp-dyn/content/article/2006/12/24/AR2006122400666_pf.html, Webley, Kayla. Since the hatchlings couldn't survive, the number of bald eagles shriveled accordingly. Weigh an average of 14 pounds (6.3 kilograms), though females are larger than males, Feature a wingspan between 5.5 and 8 feet (1.6 and 2.4 meters), Build nests weighing up to 1,000 pounds (453 kilograms). From there, eagles would ingest the fish and effectively consume the poison. It wasn't until the 1960s and 1970s that Bald Eagles became an emblem of the environmental movement as their numbers plummeted from the effects of the pesticide DDT. (Aug. 11, 2008)http://www.fi.edu/franklin/birthday/faq.html#21, "Desert Bald Eagle Returns to Endangered Species List." Weird & Wacky, Copyright © 2020 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. You consent to our cookies if you continue to use our website. (Aug. 11, 2008)http://www.fws.gov/species/species_accounts/bio_eagl.html, "Bald Eagle Recovery: Questions and Answers." ), The Secret Science of Solving Crossword Puzzles, Racist Phrases to Remove From Your Mental Lexicon. Bald eagles in Alaska were never endangered like the ones in the lower 48. The Bald Eagle is usually quite sensitive to human activity while nesting, and is found most commonly in areas with minimal human disturbance. Will 5G Impact Our Cell Phone Plans (or Our Health?! 1962: Congress later amends the act to include the golden eagle, renaming it the Bald Eagle and Golden Eagle Protection Act. “Bald eagles were officially declared an endangered species in 1967 in all areas of the United States south of the 40th parallel, under a law that preceded the Endangered Species Act of 1973. The DDT created an abundance of calcium in the eggshells too, which led to brittle eggs that easily snapped when delivered. Fish and Wildlife Service. Is there something in turkey that makes you sleepy? Is the Coronavirus Crisis Increasing America's Drug Overdoses? June 28, 2007. U.S. May 1, 2008. Fish and Wildlife Service. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. DDT had caused problems for the bald eagle because it altered the bird's nervous system. DDT had caused problems for the bald eagle because it altered the bird's nervous system. U.S. It caused female eagles to be unable to reproduce and when they did reproduce, the insecticide would often cause infertile eggs. Fish and Wildlife Service estimates 417 bald eagle nesting pairs are left in the lower 48 states. How the Macy's Thanksgiving Day Parade Works, U.S. June 28, 2007. In 2007, the bald eagle population in the United States reached a level that brought it down from the "endangered" list to the "threatened" list, so scientists are hopeful for the growth of the species.