What can fly but cannot fly high?

What is a falcons niche? How old do ducks have to be before giving them away? What do you feed a newborn cockatiel? Are hawks faster than cheetahs? Does a young and an adult flamingo look different from one another? Is there a mmorpg bird game besides the fly like a bird game? Which country national bird is penguin? How many babys do barn swallows have each year? Who was the first person to discover a macaw? What kind of birds chirp through the night? You have heard grits kills ants does it harm birds or anything else that might eat it? What kind of duck has puffor ball on their head? What prompts Canadian geese to fly south? What parasites do hummingbirds get? Is lavender oil poisonous to an African Grey? What happens if the herons food source disappeared? Do birds eat stink bugs? What kind of plants does a penguin eat? What is the possessive form of swallows? Do birds only reach adulthood?

What can fly but cannot fly high?