Question

Select the correct statement with respect to the bird's vision.

1. both eyes focus on an object to estimate the distance

2. eyes focus on two different things to increase the range of vision

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 and 2

Answer 1

Correct Answer - Option 3 : Both 1 and 2

Concept:

• Different birds have different types of vision.
• The type of vision they have depends on their source of food.

Explanation:

Monocular vision:​

• Birds with eyes on the sides of their heads have a wide visual field.
• It is useful for detecting prey.
• Such birds can focus on two different things at a time.
• When its eyes focus on two different things, it increases its range of vision.
• They don't have to move their heads to see around.
• They can see four times as far as we can.
• Example: Kites, Eagles, Vultures.

​​Binocular vision

• While those with eyes on the front of their heads have binocular vision.
• Such birds can estimate distances when hunting.
• When a bird focuses both eyes on an object, it can estimate the distance.
• They have to move their heads to see around. 
• The binocular vision of birds makes them see distinctly.
• Example: Owl, Crows, Doves, Peacock, Nightingales, Parrots, Pigeons, etc.

​Thus,  

1. both eyes focus on an object to estimate the distance: Correct

2. eyes focus on two different things to increase the range of vision: Correct