Explanation:

- Hen: While hens can fly short distances or a bit higher, they are not entirely flightless. They often use their ability to flutter to escape danger.

- Peacock: Peacocks can fly short distances despite their long, heavy tails. They often use flight to roost in trees for safety.

- Kiwi: Kiwis are flightless birds native to New Zealand. They have small wings that are not used for flying. Their adaptations focus on life on the ground.

- Crane: Cranes are strong fliers, known for their long migrations. They use flight to travel vast distances during seasonal changes.