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Subscriber Exclusive Content. Why are people so dang obsessed with Mars? How viruses shape our world. Standing nearly five feet tall, these birds inhabit marshes, shallow lakes, lagoons and estuaries. The population hit a low of fewer than 20 individual birds in that migrated between breeding grounds in Canada and wintering grounds near Aransas, Texas. Conservation of habitat helped the flock increase, but still the flock was vulnerable.
Recovery efforts now include hand raising whooping crane chicks using puppets costumed to look like adult whooping cranes so that the young do not improperly imprint to humans. Some young whooping crane are taught to migrate by following an ultralight plane with a costumed pilot. Today there are more than individual birds in North America in three flocks in addition to birds in captivity as part of breeding and reintroduction programs. The natural migratory flock still migrates from Canada to Texas each year.
A non-migratory flock was established in Florida and now numbers more than 20 birds. An introduced migratory flock of more than birds winters in Florida and breeds in central Wisconsin. Today, it is found in just a few states, and then in only a few places. However, these turtles face a challenge every year when they head upland to lay their eggs.
The upland breeding areas are now separated from their backwater habitat by a highway. Road kill is a major threat and those that do lay eggs may face danger on their return to the river. Turtle eggs are left unattended by parents and are vulnerable to scavengers such as skunks and raccoons. Mercury, another heavy metal, is also raising alarms for predator species around the world as it accumulates up food chains. Immature Bald Eagle with lead poisoning by Marge Gibson.
Other pesticides whose effects aren't yet well understood have entered the market, such as brodifacoum, one of a broader class of chemicals known as second-generation anticoagulant rodenticides, or SGARs. Although there were only five known Bald Eagle deaths from brodifacoum poisoning between and , compared to from lead, it's beginning to show up at chronic low levels in even the most isolated Bald Eagle populations, which wildlife managers are at a loss to explain.
While the future is impossible to foretell, people who know Bald Eagles the best are optimistic about what's ahead. It's impossible to see an adult Bald Eagle soaring overhead without feeling something — a flash of recognition, or maybe even a surge of hope. Thanks to a patchwork of environmental laws and the efforts of scientists, conservationists, and government agencies, more of us have the chance to experience that today than at any time in the past half-century.
There are many more success stories waiting to happen: 41 U. For now, though, the Bald Eagle remains a star. Act by December 31! Donate Now. Toggle navigation. Birds Priority Birds. Watch List. Bird of the Week. The Search for Lost Birds. Bird City Americas. Habitat Loss. Bird Collisions. Cats Invasives. Climate Change. Lack of Resources. Migratory Birds. Hawai'i Seabirds Fisheries.
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