Bald eagles are found in many environments in the United States. Those environments include deserts, mountains, freshwater, and marine areas. Bald eagles are known to build very large nests in treetops and always near water. The main source of food for bald eagles is fish, but they will sometimes eat other small animals.
In the 1900s the Environmental Protection Agency listed the bald eagle as an endangered species. During those years, DDT usage was widespread, and it is believed that its use was responsible for the decline in the number of eagles. DDT is a chemical that was used to control mosquitoes, and it caused a thinning of the eagle egg shells.
The population of breeding pairs of bald eagles has changed in several states over a 12-year period as is shown in the table below.
Population of Breeding Pairs of Bald Eagles
State Year 1 Year 3 Year 6 Year 9 Year 12
319 …show more content…
A. Maryland has fewer trees
B. Nevada had more fish
C. Maryland had more open waters *
D. Nevada has less small animals
• Why would the habitats of Maryland and Michigan support more breeding pairs than habitats in other states?
A. Grasslands provide homes for large animals.
B. Mountains provide fewer places to hunt.
C. Large lakes and rivers provide food. *
D. Croplands provide grain for food.
• All states showed an increase in the number of breeding pairs during which year?
A. Year 3
B. Year 6
C. Year 9 *
D. Year 12
• Which state showed the greatest increase in breeding pairs from Year 1 to Year 12?
B. Michigan *
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In the dirt habitat, the population of fork and knifes began to decrease while the population of spoons began to increase. For instance, in generation 2, forks accounted for 33% of the population, knives had become extinct and spoons accounted for 67% of the population. Additionally in generation 3, the total population was made up of spoons, both knives and forks had become extinct (Table 1A). As for predators in the dirt habitat, the population of pinto bean decreased during the second generation, while the populations of black beans, green beans and white beans slightly increased.
While otters are considered secure globally, the southwestern stock in Alaska is threatened. According to Alaska's Department of Fish and Game, http://www.adfg.alaska.gov/index.cfm?adfg=seaotter.main "in southwest Alaska, sea otters have experienced a sharp population decline in the last 20 years," while the Southeast and Southcentral stocks have stabilized or increased. In an email exchange with Webber, he told me that the otters washing up were assumed to be non-threatened Southcentral northern sea otters because of the location of where they came ashore. Otters have a unique history in Alaska. They bounced back from the fur trade, that began in the 1700s, that almost wiped them out.
The Native Americans of the North West Coast region adapted to their environment with the uses of fish, trees, and animal hides. The Native Americans of the North West Coast used fish as their main food resource. They made their house close to beaches and bays because it was faster to capture the fish. Fish was used more than any other food source Because it’s easier than any other food.
In the 1900s the population decreased because of the DDT ( DDT: dichlorodiphenyltrichloroethane) sickness with the eagles. Hunters are a treat to bald eagles because they will shoot them out of the sky. If a bald eagle eats a duck that has been eating lead shots that
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Black tailed prairie dogs are burrowing rodents that live in large colonies in the grasslands of central and western North America. They emerge from their burrows in daylight to forage and feed on roots, grasses, and seeds. Their head and body are 12-15 inches tall, and their tail is 3-4 inches tall. Prairie dogs are considered a keystone species because their colonies create islands of habitats that benefit approximately 150 other species. They are a food source for coyotes, black footed-ferrets, eagles, and badgers.
Introduction Congress chose the bald eagle as the national symbol of the United States of America in 1782, but this move faces a fierce opposition from Benjamin Franklin, one of the founding fathers of the nation. He was keen to make the turkey as the national symbol. Moreover, the bald eagle has an association with the ancient Roman Republic while the turkey is a true native to the United States. Body Congress made many changes to the ancient eagle symbol to accentuate the majestic beauty and strength of the large bird. It is also white –headed i.e. not the one as the classic emblem of the great Roman Republic.
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Darwin points out that one of the most significant changes in conditions for newly domesticated species is the change in the access to food and nutrition for the species. He points out that there are two ways that domestic variability can be affected, directly or indirectly. A condition that affects directly will
They have been found living in the northern states of the United States, such as, North Dakota, Minnesota, Alaska, Washington, Montana and Wisconsin. They have also been found living in the western and southwestern provinces of Canada, including, British Columbia, Alberta, Saskatchewan and Manitoba. The Northern Flying Squirrel prefers a very uncommon habitat. “The Northern Flying Squirrel lives in dense conifer or mixed conifer and deciduous forests.” (www.nhptv.org).
Objective 6: Evaluate the captive breeding and re-introduction of the Malleefowl. Re-introduced programs are intended to re-establish a species that has been extirpated and to supplement small wild populations with captive-bred individuals to prevent inbreeding (Benshemesh 1999). Action: Evaluate the effectiveness of captive breeding and re-introductions of the
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