The forward stereoscopic visual field will be the greatest in

Options

A. Cat
B. Rabbit
C. Deer
D. Horse.

Answer

To determine which animal has the greatest forward stereoscopic visual field, we can follow these steps:

### Step 1: Understand Stereoscopic Vision
Stereoscopic vision refers to the ability to perceive depth and three-dimensional structure due to the slightly different views from each eye. This is crucial for depth perception, especially in predators that rely on visual cues for hunting.

**Hint:** Consider how the positioning of the eyes affects depth perception.

### Step 2: Analyze the Options
We have four options: cat, rabbit, video, and horse. We need to compare the eye positioning and binocular vision of these animals.

**Hint:** Look at how each animal's eyes are positioned on their head.

### Step 3: Evaluate the Eye Positioning
- **Cats:** Cats have their eyes positioned more forward on their heads, which allows for a greater overlap in their field of vision. This results in a larger binocular vision area.
- **Rabbits:** Rabbits have eyes on the sides of their heads, which gives them a wider field of view but less overlap for stereoscopic vision.
- **Horses:** Similar to rabbits, horses also have laterally placed eyes, which limits their binocular vision.
- **Video:** This option does not represent an animal and can be disregarded.

**Hint:** Think about which animals are predators and how their vision aids in hunting.

### Step 4: Compare Binocular Vision Angles
- **Cats:** Cats have a binocular overlap of about 130 degrees.
- **Humans:** For reference, humans have a binocular overlap of about 120 degrees.
- **Rabbits and Horses:** Both have significantly less binocular overlap due to their eye positioning.

**Hint:** Remember that a larger binocular overlap means better depth perception.

### Step 5: Conclusion
Since cats have the greatest forward stereoscopic visual field due to their eye positioning and the largest binocular overlap, the correct answer is **cats**.

**Final Answer:** The forward stereoscopic visual field will be the greatest in **cats**.

---