Bustards, including floricans and korhaans, are large terrestrial bird

Bird

Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

s mainly associated with dry open country and steppes in the Old World

Old World

The Old World consists of those parts of the world known to classical antiquity and the European Middle Ages. It is used in the context of, and contrast with, the "New World" ....

. They make up the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Otididae (formerly known as Otidae).

Bustards are all fairly large and two species, the Kori Bustard

Kori Bustard

The Kori Bustard is a large bird native to Africa. It is a member of the bustard family. It may be the heaviest bird capable of flight....

 and the Great Bustard

Great Bustard

The Great Bustard is in the bustard family, the only member of the genus Otis. It breeds in southern and central Europe, where it is the largest species of bird, and across temperate Asia...

s are frequently cited as the world's heaviest flying birds, since both may exceed 20 kg (44 lbs).