Solution: The differences are as follows:
(a) Hibernation and Aestivation
| Hibernation | Aestivation |
| Winter sleep, also known as hibernation, is a state of reduced activity exhibited in some organisms in order to avoid extreme cold climatic conditions. | Aestivation, also known as summer sleep, is a condition of reduced activity observed in some organisms to avoid dehydration caused by the heat throughout the summer. |
| Example of Hibernation – Squirrels and bears found in cold regions hibernate in winters. | Aestivation example – in Snails and fishes aestivate in summers. |
(b) Ectotherms and Endotherms
| Ectotherms | Endotherms |
| The temperature of their bodies varies depending on their surroundings. | The temperature of the body remains constant and does not vary depending on its surroundings. |
| They are cold blooded-entities | They are warm-blooded entities |
| Examples – reptiles, fishes, amphibians | Example – mammals and birds |