The most common, most accurate way to find the age of a tree is to count the number of rings visible when their trunk is cut horizontally. Each year, most trees add an extra layer of growth to their trunks. Over time, their trunks get thicker and thicker.

How do you count the growth rings on a tree?

In summer, growth is slower; the wood has smaller cells and is darker. So when the tree is cut, the layers appear as alternating rings of light and dark wood. Click the cross section of the tree ring above to view the whole ring as it came from the tree. Count the dark rings, and you know the trees age.

What is the oldest animal on earth?

This tortoise was born in 1777. Jonathan, a Seychelles giant tortoise living on the island of Saint Helena, is reported to be about 189 years old, and may, therefore, be the oldest currently living terrestrial animal if the claim is true. Harriet, a Galápagos tortoise, died at the age of 175 years in June 2006.

Which animal is never sleep?

The bullfrog was chosen as an animal that doesnt sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting. However, there were some problems with how the bullfrogs were tested.