Select from the following a group of birds each member of which is able to see distinctly the object four times as far as we can see.

The correct answer is Eagles, Kites, Vultures.

Explanation:

Certain birds of prey, such as eagles, kites, and vultures, have specialized vision that allows them to see objects clearly from a distance four times greater than what humans can see. For example, if a human can see an object clearly from a distance of 2 meters, these birds can spot the same object from a distance of 8 meters.

Reasons for their sharp vision:

1. Large number of photoreceptors: Their eyes contain a much higher density of photoreceptor cells (cones) in the retina compared to human eyes, which provides high-resolution, detailed vision.

2. Fovea structure: Birds of prey often have two foveae (areas of sharpest vision) in each eye, allowing them to focus sharply on distant prey while maintaining spatial awareness.

Therefore, the group of birds consisting of Eagles, Kites, Vultures is the correct choice.