Which of the following animals does not belong to the same group as the others when they are classified by their usual food habits as herbivores or carnivores?

Introduction / Context:
This question tests basic biology and logical grouping skills. Many reasoning and general science questions ask which item does not fit with the others in a list. Here the grouping is based on food habits, a very common way to classify animals as herbivores, carnivores, or omnivores, which you learn in school science.

Given Data / Assumptions:
- The animals listed are fox, goat, horse, zebra, and deer.
- We are asked to find the one that does not belong to the same group as the others.
- The most natural grouping used in such questions is by eating habits, for example plant eaters versus meat eaters.
- We assume usual, natural diet in the wild and not rare or forced feeding situations.

Concept / Approach:
Herbivores mainly eat plants, grass, leaves, and other vegetation. Carnivores primarily eat meat and hunt other animals. Omnivores eat both plants and animals. Goat, horse, zebra, and deer are classic examples of grazing or browsing herbivores. A fox is a small carnivorous mammal that hunts rodents, birds, and other small animals, and may also scavenge. Thus one clear odd item appears when we classify them by diet.

Step-by-Step Solution:
Step 1: Examine goat. A goat feeds mainly on grass, leaves, and shrubs, so it is a herbivore. Step 2: Examine horse. A horse eats grass, hay, and grains, so it is also a herbivore. Step 3: Examine zebra. A zebra is a grazing animal that eats grasses in the savanna and is a herbivore. Step 4: Examine deer. Deer live in forests and meadows and feed on leaves, grass, and shoots, so they are herbivores. Step 5: Examine fox. A fox hunts rabbits, rodents, birds, insects, and may sometimes eat fruits, so its primary behaviour is that of a carnivore or omnivore with strong carnivorous habits. This makes fox different from the other four.

Verification / Alternative Check:
Another way is to remember habitat and feet structure. Goat, horse, zebra, and deer all have hooves adapted for running and grazing. Fox has paws with claws suited to hunting, and a body shape typical of a predator. Both diet and body form confirm that fox is in a different category than the four hoofed herbivores.

Why Other Options Are Wrong:
Goat is a domestic herbivore used for milk and meat but naturally eats plants.
Horse is a herbivorous animal used for riding and work, with a plant based diet.
Zebra is a wild herbivore found in Africa, feeding on grasses.
Deer is another herbivore that feeds on leaves and grass in forests and fields.
All four share similar vegetarian diets and similar limb structure, so they form one group.

Common Pitfalls:
Some students try to group the animals by domestic versus wild or by where they live. While that can work in some questions, here both domestic and wild animals appear on both sides, so that method becomes confusing. Focusing on the usual food habit is the simplest and most reliable approach. Whenever you see mixed animals in an odd one out question, first check herbivore versus carnivore classification.

Final Answer:
The correct answer is Fox, because it is the only animal in the list that is primarily carnivorous, while the others are herbivores.