Question

Which one of the following is not mammal?
A. Ornithorhynchus
B. Tachyglossus
C. Hemidactylus
D. Funambulus

Answer 1

Mammals is a class which belongs to the phylum Chordata of Animal kingdom. Animals have no cell wall in their cell. Mammals are the animals that have special glands called mammary gland (characteristic feature).

Step by step answer: Ornithorhynchus also known as Platypus is an egg-laying mammal.
Tachyglossus and Funambulus both are mammals but Funambulus belong to the family of squirrel.

Characters of mammals: They found in a variety of habitats searches deserts, mountains, and polar ice caps. The most unique character of mammals is the presence of a milk-producing gland also known as the mammary gland. The skin of mammal is unique as it possesses hairs. Respiration is by the lungs. Different types of teeth are present in the jaw. Sexes are separate and fertilization is internal they are mostly viviparous with few exceptions and development is direct.
Hemidactylus belong to class Reptilia. They also are known as wall lizard and belongs to the gecko family.
Hence option C is correct.
Additional information :
Characters of class reptilia: The class name refers to their creeping mode of locomotion. They are mostly terrestrial animals and their body is covered by dry and cornified skin, epidermal scales. They do not have external ear openings. The heart is usually three-chambered but in crocodile, it is four-chambered.
Sexes are separate, fertilization is internal and they are oviparous and development is direct.

Note: One of the important difference between reptiles and mammals is that reptiles are cold-blooded animals (poikilothermous), i.e., they cannot regulate their internal temperature. On the other hand, mammals are hot-blooded (homoiothermous), i.e., they can regulate their internal temperature.