The lifespans of animals on our planet can vary wildly between different species and living conditions. 

We can see the evidence of this in our world all around us, especially if you are a pet owner that has lost a furry friend. 

Why is this the case? Does it have to do with the animals size?

We often observe that small insects have a much shorter lifespan than larger animals, which have a shorter lifespan than even larger animals. 

Unfortunately it is not as simple as that, because there are many animals that do not fit into this pattern. 

Check out the Ted-Ed video below to learn about the three key things that scientists think control the aging process and what that means for us. 

Let me know what you think about this fascinating video or tell me how long you would live if you could choose in the comments below.