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Which gruiform bird is considered the worldâs heaviest flying animal?
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Gruiform
White-naped crane (Grus vipio).
The kori bustard (Ardeotis kori) is considered the worldâs heaviest flying animal.12
As a member of the bustard family (Otididae) within the order Gruiformes, adult males of this species are robust birds that can weigh 18.1 kg (40 pounds) or more. While they are capable of flight, they are primarily terrestrial, preferring to walk on open ground in grasslands and semidesert areas of Africa.13