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Eagles have eyes positioned in their heads 30 degrees from the facial midline, giving them a field of view of 340 degrees. In eagles as large as 10 pounds, their eyes are as physically large as adult humans<ref>https://books.google.co.in/books?id=O5J8JK07QykC&pg=PA11&redir_esc=y&hl=en#v=onepage&q&f=false</ref>; unlike human eyes they are fixed in their sockets and do not rotate. Within each eye are two regions of the retina called “foveas” which are specialized for acute eyesight: the shallow fovea – which points forward 15 degrees right or left of the head axis - and the deep fovea, which has higher acuity and points forward as well, but with 45 degrees relative of the head axis<ref>http://jeb.biologists.org/content/203/24/3745.long?utm_source=TrendMD&utm_medium=cpc&utm_campaign=J_Exp_Biol_TrendMD_0</ref>. The end result is a light gathering power and magnification which gives eagles extremely keen eyesight - estimated to be four to eight times better than humans<ref>https://healthypets.mercola.com/sites/healthypets/archive/2015/02/03/eagle-eyes.aspx</ref> - enabling them to locate, discern, identify, and successfully kill an animal as small as a rabbit from a distance of two or more miles away<ref>https://allabouteyes.com/blog/best-eyes-animal-kingdom/</ref>.
Eagles have eyes positioned in their heads 30 degrees from the facial midline, giving them a field of view of 340 degrees. In eagles as large as 10 pounds, their eyes are as physically large as adult humans<ref>https://books.google.co.in/books?id=O5J8JK07QykC&pg=PA11&redir_esc=y&hl=en#v=onepage&q&f=false</ref>; unlike human eyes they are fixed in their sockets and do not rotate. Within each eye are two regions of the retina called “foveas” which are specialized for acute eyesight: the shallow fovea – which points forward 15 degrees right or left of the head axis - and the deep fovea, which has higher acuity and points forward as well, but with 45 degrees relative of the head axis<ref>http://jeb.biologists.org/content/203/24/3745.long?utm_source=TrendMD&utm_medium=cpc&utm_campaign=J_Exp_Biol_TrendMD_0</ref>. The end result is a light gathering power and magnification which gives eagles extremely keen eyesight - estimated to be four to eight times better than humans<ref>https://healthypets.mercola.com/sites/healthypets/archive/2015/02/03/eagle-eyes.aspx</ref> - enabling them to locate, discern, identify, and successfully kill an animal as small as a rabbit from a distance of two or more miles away<ref>https://allabouteyes.com/blog/best-eyes-animal-kingdom/</ref>.
Eagles are found on all continents except Antarctica, from the cold waters of the Arctic north to the tropical rain forests of Africa, Asia, and South America. They are monogamous, mating for life, and using the same nest every year, which is placed in an inaccessible site (called an eyrie), such as the top of a tree or a cliff face. The clutch of three to four eggs take six to eight weeks to hatch, but when hatched the young mature slowly, putting on their adult plumage in three to four years.
The killing stroke is done with the feet, although recent studies have indicated that the feet function primarily to immobilize the prey, with the actual death resulting from blood loss and the commencement of feeding when the prey animal has been immobilized<ref>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2776979/</ref>. Eagles have large, deeply-curved talons, with the third and fourth digits bearing talons larger than the other two. These talons - combined with a grip that has been estimated to be at least 400 psi (in golden and bald eagles) - ensure that the talons are driven deeply into the prey<ref>http://www.startribune.com/hawks-fierce-grip-to-be-feared/364253441/</ref><ref>https://www.irishtimes.com/life-and-style/people/an-eagle-can-crush-a-monkey-s-skull-with-one-foot-1.2761798</ref>. In one instance, a trainer admitted that a trained harpy eagle - with a grip strength described as similar to the power of a rottwieler's jaws - got off the glove and onto his arm, and still in a relaxed state, drove its rear claw through the flesh to the bone<ref>https://www.youtube.com/watch?v=xQrK3dswN_c</ref>.
Eagles are found on all continents except Antarctica, from the cold waters of the Arctic north to the tropical rain forests of Africa, Asia, and South America. They are monogamous, mating for life, and using the same nest every year, which is placed in an inaccessible site (called an eyrie), such as the top of a tree or a cliff face. The clutch of three to four eggs take six to eight weeks to hatch, but when hatched the young mature slowly, putting on their adult plumage in three to four years.
==Use as symbols==
==Use as symbols==