Which two animals are able to generate internal heat to maintain their body temperature in a cold environment? parrot snake frog dog crocodile

The correct answer is Parrot and Dog.

The animals which can maintain their body temperature by generating internal heat are called as warm-blooded animals or endotherms. They maintain constant temperature irrespective of the temperature in their surrounding.

These animals mainly include birds and mammals.

On the contrary, the cold-blooded animals ( ectotherms) are those, which absorb heat from surrounding and do not generate much of the internal heat. Their temperature fluctuates as the surrounding temperature changes. These animals include reptiles, amphibians, fishes, and invertebrates.  

Thus, the correct answer is parrot ( bird) and Dog( mammal)  

parrot and dog.

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