Birds and mammals share one of the following characteristics as a common feature.
a. Pigmented skin
b. Pneumatic bones
c. Viviparity
d. Warm-blooded

Answers (1)

Ans-The answer is the option (d), Warm-blooded

Explanation:
A distinguishing feature of warm-blooded animals is that they can maintain constant body temperature, irrespective of the surrounding environment. In other words, their body temperature is fixed. This is the common characteristic feature in birds and
mammals. Higher reptiles are the first to evolve this characteristic. Later the birds and mammals acquire this feature from higher reptiles during evolution. Concerning, pigmented skin is an adaptive feature in mammals, and which are not present in birds. Pneumatic bones are found only in birds as their flight version.These reduce bodyweight for flight.

Viviparity is shown by mammals and not by birds as they are oviparous, i.e. lay eggs.

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