Question

The tallest living mammal is
A) Whale
B) Giraffe
C) Rhinoceros
D) Elephant.

Answer 1

Mammals are the most developed species under the Animal Kingdom. They come under the category of Vertebrata. The main characteristic feature is the presence of the mammary gland. Some mammals can lay eggs also.

Complete answer:
The Giraffe is an African Artiodactyl mammal. It is the tallest living mammal and largest ruminant. Its main characteristics are extremely long neck and legs and horn-like ossicones distinctive coat patterns. It comes under the family Giraffidae. They are herbivores. They mainly feed on fruits, flowers and acacia leaves. The main predators are lions, hyenas, leopards and tigers. Fully grown Giraffes reach up to $14 - 18ft$. They are inhabitants of savannas and grassland. Reproduction follows a polygamous pattern and they have a gestation period of $400 - 600$ days. Giraffes have a life span of $38$ years.
Whales are a group of aquatic placental mammals. Sperm Whale is one of the largest tooth predators on Earth. Sexual dimorphism is seen in them i.e. females appear larger than males. Whales are divided into eight categories which include. Blue whale is the largest creature that has ever lived.
Whales consist of eight extant families:
1. Balaenopteridae
2. Balaenidae
3. Cetotheriidae
4. Eschrichtiidae
5. Monodontidae
6. Physeteridae
7. Kogiidae
8. Ziphiidae
Rhinoceros belongs in the family Rhinocerotidae. They are species native to Africa and Southern Asia. The term "rhinoceros" is often more applied to now extinct species of the superfamily Rhinocerotoidea. There are two subspecies of rhinoceros namely white rhinoceros and black rhinoceros. The black, Javan, and Sumatran rhinoceros as critically endangered species according to the IUCN Red List.
Elephants are the largest existing land animals. They are currently categorised as African bush elephant, the African forest elephant, and the Asian elephant. According to the International Union for Conservation of Nature (IUCN) African bush elephants and Asian elephants are endangered species and African forest elephants are critically endangered.

So the correct answer is Option B.

Notes:
Killing elephants for their tusks is the major threat to the elephant population. Similarly Rhinos are being hunted for horns when being sold in black market gives money similar to gold. Whales are held captive and being trained to perform tricks for entertaining purposes.