Although Hippogriffs are native to Europe, the hogwarts herd lives in the Forbidden Forest. In Newt Scamander's Fantastic Beasts he explains, When Hippogriffs are breeding they will build a nest on the ground and lay a single large egg on the ground, which hatches within 24 hours. Hippogriffs can usually fly within a week of birth, but it takes many months before they are able to travel great distances. In the wizarding world, those who keep Hippogriffs in their homes are bound by wizarding law to perform a Disilusionment Charm on their pets to prevent muggles from noticing.