Deinocheiridae

1. Ornithomimus 2. Struthiomimus 3. Deinocheirus 4. Gallimimus 5. Anserimimus

Megaraptorians: The Ultimate Predators
Megaraptoridae
Megaraptorans were medium to large-sized theropods, ranging from Fukuiraptor, which was about 4.2 meters (14 feet) in length, to the 8.4 meters (28 feet) long Orkoraptor, the 9 to 1...

Caenagnathoids (Caenagnathiformes)
Oviraptorosauria is a clade of Cretaceous theropod dinosaurs of uncertain affinities within Maniraptoriformes.The results of a phylogenetic analysis using 195 characters scored for four outgroup an...

Penguins (Sphenisciformes)

1. Palaeeudyptes 2. Pachydyptes 3. Platydyptes 4. Anthropornis 5. Waimanu

Plotopteridae
Plotopteridae is an extinct family of flightless seabirds with uncertain placement, generally considered as member of order Suliformes. Plotopteridae was a large-sized diving birds, roughly similar to the contemporary giant ...

Parrots (Psittaciformes)
The largest parrot was Heracles inexpectatus
 

Storks and allies (Ciconiiformes)

The largest of Ciconiiformes was Leptoptilos robustus, standing 1.8 metres (5.9 ft) tall and weighing an estimated 16 kilograms (35 lb).

Titanis, which is about 2.5m. tall, as tall as a forest elephant.
It lived approximately 5-2 million years ago (early Pliocene to early Pleistocene) in North America. Fossil evidence has been found in Gilchrist County, Florida dating from...

Phorusrhacidae (terror birds) 
1. Gastornis parisiensis 2. Phorusrhacos longissimus 3. Dromornis autralis 4. Kelenken guillermoi
Phorusrhacids, colloquially known as terror birds, are an extinct clade of large carnivorous flightless bird...

Teratornithidae
Teratorns are an extinct group of giant predatory birds that are classified in the bird family Teratornithidae.The name “teratorn” means “Wonder Bird,” a name given because of the size, uniqueness...

Bony-toothed birds Pelagornithidae (Odontopterygiformes)
The Pelagornithidae,commonly called bony-toothed birds, false-toothed birds or pseudotooth birds,are a prehistoric family of large seabirds.
Even "small" species of pseudotooth birds...

Battle of the Big Birds

P. sandersi‘s size puts it just ahead of Argentavis, previously considered the largest bird known. Argentavis, distantly related to today’s Andean condor, ruled the skies over South America 6-...