Why does the fur of animals stop growing/shed past a certain length but we have to manually cut our own hairs?

Question

Why does the fur of animals stop growing/shed past a certain length but we have to manually cut our own hairs?

In: Biology

Answer 1

Fur grow a certain length before it will shed. So the average length for this to happen is the length of the fur.

The same thing happen do us. Thats why you don’t need to cut most of your hair. Hair on the head and beard will on average grow very long before shedding. If you want it shorter you manually cut it, but you are not ending up with long fur all over your body if you don’t shave.