The smallest species

The smallest species of eagle is the South Nicobar serpent eagle (Spilornis klossi), at 450 g (1 lb) and 40 cm (16 in). The largest species are discussed below. Like all birds of prey, eagles have very large hooked beaks for ripping flesh from their prey, strong, muscul

ar legs, and powerful talons. The beak is typically heavier than that of most other birds of prey. Eagles’ eyes are extremely powerful. It is estimated that the martial eagle, whose eye is more than twice as long[clarification needed] as a human eye, has a visual acui

ty 3.0 to 3.6 times that of humans. This acuity enables eagles to spot potential prey from a very long distance.[2] This keen eyesight is primarily attributed to their extremely large pupils which ensure minimal diffraction (scattering) of the incoming light. The female of all known species of eagles is larger than the male.[3][4]

Eagles normally build their nests, called eyries, in tall trees or on high cliffs. Many species lay two eggs, but the older, larger chick frequently kills

its younger sibling once it has hatched. The dominant chick tends to be a female, as they are bigger than the male. The parents take no action to stop the killing.[5][6]