For which one of the following snakes is the diet mainly composed of other snakes?

1. Introduction to India's Reptile Diversity (basic)

India is a globally recognized mega-diverse country. While we occupy only 2.4% of the world's land area, we host a staggering variety of life, including nearly 7% of all recorded species Shankar IAS Academy, Chapter 12, p.151. In the realm of reptiles specifically, India holds a prestigious position, ranking fifth in the world for species richness. This diversity is driven by our unique geography — from the humid rainforests of the Western Ghats to the arid deserts of Rajasthan, each ecosystem provides a niche for specialized reptilian life.

Understanding India's reptiles requires looking at their specialized survival behaviors. For example, some species have evolved highly specific diets. The King Cobra (Ophiophagus hannah) is famously ophiophagous, a term derived from Greek meaning "snake-eating." It predominantly hunts other snakes, sometimes even specializing in a single species Shankar IAS Academy, Chapter 12, p.188. Other reptiles, like the Russell’s Viper, rely on defensive aggression; it is known for being highly irritable, producing a loud hiss and striking with incredible speed when threatened Shankar IAS Academy, Chapter 12, p.191.

Beyond snakes, India’s reptile diversity includes unique lizards and chelonians (turtles and tortoises). We find localized species like the Sispara Day Gecko in the Nilgiris and the critically endangered Red-Crowned Roofed Turtle in the Ganga River basin Majid Hussain, Environment and Ecology, p.15. This variety isn't just a modern fluke; fossil records of ancient reptiles like the Mesosaurus provide vital clues about how India was once part of a massive contiguous landmass millions of years ago PMF IAS, Physical Geography, p.97.

Sources: Environment, Shankar IAS Academy, Chapter 12: Animal Diversity of India, p.151, 188, 191; Physical Geography by PMF IAS, Tectonics, p.97; Environment and Ecology, Majid Hussain, BIODIVERSITY, p.15

2. Legal Protection: WPA 1972 and CITES (intermediate)

To understand how we protect wildlife, we must look at two major frameworks: the domestic Wildlife (Protection) Act (WPA), 1972 and the international treaty CITES. The WPA 1972 was a landmark shift in India's conservation history. Before it existed, 'Forests' and 'Wildlife' were primarily State subjects, meaning the Central Government had limited power to intervene. However, using specific constitutional provisions (Articles 249, 250, and 253), the Parliament enacted this uniform law to protect species across the country Environment, Shankar IAS Academy, Protected Area Network, p.211. One critical evolution occurred in 1991: the power of State Governments to declare animals as 'vermin' (species that can be hunted freely because they are pests) was largely withdrawn, centralizing protection decisions Environment, Shankar IAS Academy, Protected Area Network, p.212.

The WPA operates through Schedules. In the traditional 1972 framework, species were listed in Schedules I through VI based on their risk of survival and the severity of the threat they faced. Schedule I and Part II of Schedule II provide absolute protection, with the highest penalties for violations. In contrast, while the WPA is a national law, CITES (Convention on International Trade in Endangered Species) is an international agreement that regulates the trade of wildlife. While they are different, they work together: the IUCN Red Data Book identifies which species are in danger (using 'pink pages' for critically endangered species), and then WPA and CITES provide the legal teeth to stop people from killing or trading them Environment and Ecology, Majid Hussain, Biodiversity, p.11.

Feature	Wildlife Protection Act (WPA) 1972	CITES / IUCN Red List
Scope	National (India) law.	International treaty/Global status.
Mechanism	6 Schedules (listing species for protection levels).	3 Appendices (regulating international trade).
Key Goal	Prohibit poaching, smuggling, and illegal trade within India.	Ensure international trade doesn't threaten survival.

Sources: Environment, Shankar IAS Academy, Protected Area Network, p.211-212; Environment and Ecology, Majid Hussain, Biodiversity, p.11; Environment, Shankar IAS Academy, Schedule Animals of WPA 1972, p.171

3. Habitats and Ecosystem Niches (intermediate)

To understand wildlife behavior, we must first distinguish between where an animal lives and what it actually does. Think of a Habitat as an organism's 'address'—it is the physical environment characterized by specific terrain, climate, and vegetation. For instance, the Western Ghats provide a complex habitat where evergreen forests, sholas (stunted tropical montane forests), and grasslands intersperse to create homes for thousands of species Environment, Shankar IAS Academy, Chapter 12, p.159. Factors like drainage, soil type, and altitude determine the boundaries of these habitats Environment and Ecology, Majid Hussain, BIODIVERSITY, p.9.

In contrast, an Ecological Niche is the 'profession' or functional role of a species within that address. A niche encompasses everything a species needs to survive: its diet, its active hours, and how it interacts with other species. In high-density ecosystems like equatorial rainforests, competition is so intense that niches are often distributed vertically rather than horizontally. Different species occupy different 'floors' of the forest—from the dark floor to the sun-drenched canopy—to avoid direct competition for light and resources Environment and Ecology, Majid Hussain, MAJOR BIOMES, p.5.

Some animals occupy a very specialized niche, meaning they have a highly restricted diet or behavior. A classic example is the King Cobra (Ophiophagus hannah). While many snakes are generalist predators eating rodents or birds, the King Cobra is predominantly ophiophagous—it specializes in hunting and eating other snakes Environment, Shankar IAS Academy, Chapter 12, p.188. This extreme specialization reduces competition with other large predators in the same habitat, effectively carving out a unique functional role for the species.

Feature	Habitat (The Address)	Niche (The Profession)
Focus	Physical space and environmental conditions.	Functional role and biological activity.
Exclusivity	Many species can share the same habitat.	No two species can occupy the exact same niche indefinitely.
Example	Tropical rainforest floor.	Specialized predator of other reptiles (e.g., King Cobra).

Sources: Environment, Shankar IAS Academy, Chapter 12: Animal Diversity of India, p.159, 188; Environment and Ecology, Majid Hussain, BIODIVERSITY, p.9; Environment and Ecology, Majid Hussain, MAJOR BIOMES, p.5

4. Ecological Terms: Trophic Levels and Specialization (intermediate)

In the study of wildlife behavior and ecology, Trophic Levels represent the functional positions species occupy within a food chain. Think of it as a ladder of energy: at the base are the producers (plants), followed by herbivores, and then various levels of carnivores. According to Science, Class VIII NCERT, How Nature Works in Harmony, p.200, herbivores like hares occupy the second level, while small carnivores sit at the third, and large "top" carnivores like tigers or vultures occupy the highest levels. This hierarchy isn't just about who eats whom; it's about the efficiency of energy transfer throughout the ecosystem.

Within these levels, animals exhibit different degrees of Feeding Specialization. While some animals are generalists (eating a wide variety of foods), others are specialists that have evolved to exploit a very specific ecological niche. A fascinating example is Ophiophagy, a specialized behavior where a predator feeds primarily or exclusively on snakes. This specialization allows a species to reduce competition with other predators by utilizing a food source that others might find dangerous or difficult to catch. For instance, while a typical secondary consumer might eat any meat for sustenance Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.103, a specialist refined by evolution will ignore easier prey to seek out its specific target.

Feature	Generalist Species	Specialist Species
Diet	Broad range (e.g., Raccoons, Crows)	Narrow/Specific (e.g., Koalas, King Cobras)
Niche Width	Wide; can adapt to various habitats	Narrow; highly adapted to one niche
Survival Strategy	High adaptability to environmental change	High efficiency in a stable environment

It is also important to distinguish how energy enters these levels. The Grazing Food Chain begins with living plant biomass, whereas the Detritus Food Chain starts from dead organic matter consumed by decomposers Environment, Shankar IAS Academy, Functions of an Ecosystem, p.12. Specialized predators can exist at the top of either chain. Understanding whether a species is a generalist or a specialist helps conservationists predict how wildlife will react to habitat loss; a specialist is often the first to face extinction if its specific resource disappears.

Sources: Science, Class VIII NCERT, How Nature Works in Harmony, p.200; Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.103; Environment, Shankar IAS Academy, Functions of an Ecosystem, p.12

5. Dietary Habits: Ophiophagy and Cannibalism (exam-level)

In the fascinating world of wildlife behavior, dietary specializations often define a species' niche. Two specific terms you must master for your environment and ecology preparation are Ophiophagy and Cannibalism. Ophiophagy (from the Greek ophis for snake and phagein to eat) refers to the habit of animals that specialize in hunting and eating snakes. While many predators like the Shikra or Bengal Fox are generalists that might occasionally take a snake Science, Class VIII NCERT, How Nature Works in Harmony, p.198, an ophiophagous animal makes snakes the primary component of its diet.

The most iconic example of this is the King Cobra (Ophiophagus hannah). Its very scientific name tells the story of its diet. Unlike the common Rat Snake or Russell’s Viper, which primarily hunt rodents and frogs in the grassland ecosystem Science, Class VIII NCERT, How Nature Works in Harmony, p.199, the King Cobra is a specialist. It preys on other snakes—including venomous ones like kraits and even smaller cobras. This leads us to the second concept: Cannibalism. In the wild, when a predator consumes a member of its own species, it is termed cannibalism. For the King Cobra, this is not just an accident; it is a known behavioral trait, especially when food is scarce or territory is contested.

Ecologically, this is a highly specialized form of predation. While predation generally involves one species benefiting at the expense of another Environment, Shankar IAS Academy, Functions of an Ecosystem, p.17, ophiophagy places the predator at a very high trophic level because it is essentially a "predator of predators." This specialization requires unique adaptations, such as immunity to the venom of the prey and metabolic systems capable of processing the dense proteins of other reptiles.

Dietary Habit	Primary Target	Key Example
Ophiophagy	Snakes	King Cobra
Generalist Predation	Rodents, Amphibians, Birds	Russell's Viper, Kraits
Cannibalism	Same Species	King Cobra (during scarcity)

Sources: Science, Class VIII NCERT (Revised ed 2025), How Nature Works in Harmony, p.198-199; Environment, Shankar IAS Academy (10th ed.), Functions of an Ecosystem, p.17

6. Solving the Original PYQ (exam-level)

Now that you have mastered the concepts of ecological niches and specialized predation, this question serves as a perfect application of how species evolve to fill specific roles in an ecosystem. In our study of biodiversity, we discussed how niche specialization reduces competition for resources. The King cobra (Ophiophagus hannah) is the quintessential example of an ophiophagous predator. The very name 'Ophiophagus' is derived from Greek, meaning 'snake-eater,' which directly connects the biological classification of the animal to its primary behavioral trait studied in Environment by Shankar IAS Academy.

To arrive at the correct answer, you must look beyond the general category of 'venomous snakes' and identify the specialist. While many snakes are opportunistic hunters, the King cobra is uniquely adapted to track, overpower, and consume other snakes, including venomous ones. A key reasoning cue here is the scale of the predator; as the world's longest venomous snake, it requires a high-protein diet that smaller prey like rodents cannot always satisfy as efficiently as other reptiles. This specialized diet is a defining characteristic that sets it apart in the Animal Diversity of India.

UPSC often uses common 'Big Four' venomous snakes like the Krait and Russell’s viper, or famous international species like the Rattlesnake, as distractors. The trap is to assume that all dangerous snakes share the same predatory habits. However, these three species are primarily generalist predators whose diets consist mostly of rodents, small mammals, and amphibians. While a Krait might occasionally exhibit cannibalistic tendencies, only the King cobra has a diet mainly composed of other snakes. Therefore, (D) King cobra is the only choice that fits the specific dietary criteria of the question.

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