How do you know when a girl duck is pregnant?

Can an eagle jump on his prey? How does having webbed feet enable a turtle to propel itself in water? What is the wingspan of the kalang? How do you get wings in eudemons? How did the barnacle goose get its name? When do bats feed? Is a flock of geese called a pack? Do bald eagles like to eat fish or berries and nuts? Why do bird move their neck often? Can zebra live with parakeet? What is the scientific name food sources and trophic level of a bird? 8 letter bird names? How many phonemes are in the word bird? Is N95 mask the most effective mask to protect from bird flu virus? Do swans continue to use their nest after hatching? What kind of berrys do toucans eat? What country shares its name with a bird traditionally eaten at Christmas? What is a pheasants nest called? What is the luhya word for crane? What did Hercules do to kill the Stymphalian birds?