Animals that possess an amnion; creatures whose embryos develop within an amniotic membrane, including reptiles, birds, and mammals.
From amnion plus the Latin collective suffix -ata. This is a formal zoological classification term for the major group of vertebrates with this adaptation.
Amnionata includes you, eagles, snakes, and dinosaurs—but not fish or frogs, which is why fish eggs die if they dry out but bird eggs can sit in a nest: the amnion is a water-carrying suitcase.
Complete word intelligence in one call. Free tier — 50 lookups/day.