Raptors have always fascinated mankind, owls for their highly sensitive vision, and eagles
for their high visual acuity. We summarize what is presently known about the eyes as well as …

Diurnal raptors (birds of the orders Accipitriformes and Falconiformes), renowned for their
extraordinarily sharp eyesight, have fascinated humans for centuries. The high visual acuity …

Barn owls are nocturnal predators which have evolved specific sensory and morphological
adaptations to a life in dim light. Here, some of the most fundamental properties of spatial …

Some shorebird species forage with the same feeding strategy at night and during daytime,
eg visual pecking in the Wilson's Plover (Charadrius wilsonia) or tactile probing in the Short …

We examined in selected wading bird species if diurnal or nocturnal foraging and the use of
visual or tactile feeding strategies could be correlated with retinal structure and function. The …

Differences in visual capabilities are known to reflect differences in foraging behaviour even
among closely related species. Among birds, the foraging of diurnal raptors is assumed to …

Barn owls are effective nocturnal predators. We tested their visual performance at low light
levels and determined visual acuity and contrast sensitivity of three barn owls by their …

More so than any other terrestrial vertebrate, birds rely most heavily on their ability to assess
their visual environment. High visual acuity is not only necessary to find and acquire food …

To be adaptively useful, internal circadian clocks must be entrained (synchronized) to daily
rhythms in the external world. The entraining process adjusts the period of the internal clock …

Many aspects of an animal's ecology are associated with activity pattern, the time of day
when that animal is awake and active. There are two major activity patterns: diurnal, active …