How big are penguins necks?

How exactly does DDT harm the peregrine falcon? What color is the inside of a pistachio nut? Why do quail eggs have different patterns on the shell? What bird flies forwards and backwards? What are the unique features of housefly? What is the ticker symbol for American eagle? Ostrich meat is halal? What happens to the number of owls if the amount of grass increase? How long do female mallards sit on their eggs? Do flamingos play? How big are vultures? What does it mean to have a single bat at the front door? Which animals gather in groups called musters? Where do snow geese migrate to during the winter? What is the 3 types of ostrich? How do airports control seagulls? Where do swallows live? How do kiwis survive in winter? What is a small seabird? What is the smartest type of owl?