With 34 species, Australia possesses over half of the world's remaining alvarezsaurs (popularly called "Alvies"). This bizarre group of theropods reached its evolutionary zenith during the early Cenozoic, but subsequently vanished from many parts of the world, perhaps through competition with ground-running true birds. Most extant species are small, cryptic forest and woodland animals. Larger forms can only be found in Australia and New Guinea.
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