Do Birds and Fish have bones in their wings, fins, and tail? Explain why?

Yes, most of the fish and birds have bones in their tails, fins, and wings to support their body framework and also to protect their body organs.
In fish, the bones in fins and tail enable it to swim easily through the water currents, change its direction of movement, and also prevent it from rolling over while swimming.
In birds, the bones are pneumatic, i.e. they are filled with air. This property reduces the bodyweight of birds and allows them to fly effortlessly in the sky.