Eagle was a seminal British children's comic, first published from 1950 to 1969, and then in a relaunched format from 1982 to 1994. It was founded by Marcus Morris, an Anglican vicar from Lancashire. Morris edited a parish magazine called The Anvil, but felt that the church was not communicating its message effectively. He was also disillusioned with contemporary children's literature, and with Anvil artist Frank Hampson created a dummy comic based on Christian values. Morris hawked the idea to several Fleet Street publishers, with little success, until Hulton Press decided to take it on.

Following a huge publicity campaign, the first issue of Eagle was released in April 1950. Revolutionary in its presentation and content, it was enormously successful; the first issue sold about 900,000 copies. Featured in colour on the front cover was the comic's most recognisable story, Dan Dare, Pilot of the Future, created by Hampson with meticulous attention to detail. Other popular stories included Riders of the Range and P.C. 49. Eagle also contained news and sport sections, and educational cutaway diagrams of sophisticated machinery. A members club was created, and a range of related merchandise was licensed for sale.

Eagles are members of the bird family Accipitridae, and belong to several genera which are not necessarily closely related to each other. Most of the more than 61 species occur in Eurasia and Africa. Outside this area, just two species (the Bald and Golden Eagles) can be found in the United States and Canada, nine more in Central and South America, and three in Australia.

Eagles are large, powerfully built birds of prey, with a heavy head and beak. Even the smallest eagles, like the Booted Eagle (which is comparable in size to a Common Buzzard or Red-tailed Hawk), have relatively longer and more evenly broad wings, and more direct, faster flight. (Despite reduced size in aerodynamic feathers) Most eagles are larger than any other raptors apart from some vultures. Species named as eagles range in size from the South Nicobar Serpent Eagle, at 450 g (1 lb) and 40 cm (16 in), to the 6.7 kg (14.7 lbs) Steller's Sea Eagle and the 100 cm (39 in) Philippine Eagle. Like all birds of prey, eagles have very large hooked beaks for tearing flesh from their prey, strong muscular legs, and powerful talons. The beak is typically heavier than most other birds of prey. They also have extremely keen eyesight (up to 3.6 times human acuity for the martial eagle) which enables them to spot potential prey from a very long distance. This keen eyesight is primarily contributed by their extremely large pupils which ensure minimal diffraction (scattering) of the incoming light. The female of all species of eagle known are larger than the male.