Gibbons, proboscis monkeys and Rhinoceros found in which of the following subregion of oriental Zoogeographical region ?

Question

Accepted Answer

The correct answer is Option 4: Indo-Malayan subregion.

### Explanation for Option 4: Indo-Malayan subregion

The Indo-Malayan subregion is a part of the Oriental Zoogeographical region, which is known for its rich biodiversity and unique fauna. This subregion includes areas such as the Malay Peninsula, the islands of Sumatra, Borneo, and Java, and extends to the Philippines. It is characterized by a tropical climate and dense rainforests, which provide an ideal habitat for a variety of species, including gibbons, proboscis monkeys, and rhinoceroses.

1. **Gibbons**: These are small apes found in the dense forests of Southeast Asia, particularly in the Indo-Malayan subregion. They are known for their brachiation ability, swinging from tree to tree, which is facilitated by the dense forest canopy found in this subregion.

2. **Proboscis Monkeys**: These monkeys are endemic to the island of Borneo, which is part of the Indo-Malayan subregion. They are known for their distinctive large noses and are typically found in mangrove forests, swamps, and coastal areas within this subregion.

3. **Rhinoceroses**: The Indo-Malayan subregion is home to the Sumatran and Javan rhinoceroses, both of which are critically endangered species. These rhinoceroses inhabit the dense tropical forests and swamps of the region, which provide the necessary environment for their survival.

### Explanation for why other options are incorrect:

1. **Indian subregion**: While the Indian subregion is part of the Oriental Zoogeographical region, it is more associated with species like the Bengal tiger, Indian elephant, and Indian rhinoceros. Gibbons and proboscis monkeys are not typically found in this subregion.

2. **Ceylonian subregion**: This subregion primarily refers to the island of Sri Lanka. While it has its own unique fauna, such as the Sri Lankan elephant and leopard, it does not naturally host gibbons, proboscis monkeys, or rhinoceroses.

3. **Indo-China subregion**: This subregion includes countries like Vietnam, Laos, and Cambodia. While it shares some species with the Indo-Malayan subregion, the specific combination of gibbons, proboscis monkeys, and rhinoceroses is more characteristic of the Indo-Malayan subregion, particularly due to the presence of proboscis monkeys which are endemic to Borneo.

In conclusion, the Indo-Malayan subregion is the correct answer because it uniquely supports the habitats and ecological requirements of gibbons, proboscis monkeys, and rhinoceroses, making it the most appropriate choice among the given options.