Question

Why do birds have hollow bones ? What will be answer for 5th Standard that why do burds have hollow bones ?

Answer 1

Answer:

Hollow bones are also called pneumatized bones, meaning they're filled with space for air. It is thought that this structure helps with oxygen intake during flight. Air sacs are attached to the hollow areas in a bird's bones. ... This helps birds take in oxygen while both inhaling and exhaling

Explanation:

Hope it helps

Answer 2

to reduce weight

Explanation:

we know that to fly, we have to have the least weight. so birds bones are hollow to reduce weight. also by the bones being hollow, they are stronger that way.