Question

Why in birds, bones are light and hollow, filled with air cavities?

Answer 1

Birds:

Birds are warm-blooded animals that are able to fly.

Characteristic features in birds:

There are certain characteristics features in birds:

1. Birds have well-developed flight muscles.
2. Forelimbs of birds are modified into wings.
3. Birds have hollow bones that help them to fly by making their bodies lightweight.
4. Tail in the birds helps in changing directions during flight.
5. The tail acts as a brake, balancing and helps in changing directions (steering).

Final answer: Birds, bones are light and hollow, filled with air cavities to make the body weigh light for flight in the air.