Swifts are small birds that can fly very fast.
Swifts are usually seen as very agile and graceful birds.
Examples:
I saw some swifts flying in the sky.
The swifts zoomed through the air.
The swifts build their nests in high places.
The swifts are like little rockets in the sky.
The swifts are the fastest birds in the world!
I wish I could fly as fast as the swifts.