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Combining fossil calibration points, DNA sequences, maximum likelihood, and Bayesian analysis, the penguin calibrations imply a radiation of modern (crown group) birds in the Late Cretaceous.
This includes a conservative estimate that modern sea and shorebird lineages diverged at least by the Late Cretaceous about 74 million years ago.
The initial diversification of modern ornithurines might have taken place in the late Cretaceous (phylogenetic fuse model), but the explosive adaptive radiation followed the K–T extinction event.
This explosive, punctuated model, following a major extinction event, reflects the standard pattern of vertebrate evolution, especially documented following the Permian extinctions.
The fossils, in a new genus (Waimanu), provide a lower estimate of 61–62 Ma for the divergence between penguins and other birds and thus establish a reliable calibration point for avian evolution.
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Birds occupy all continents and habitats but, of course, some continents & some habitats have more species than others.
How are birds currently distributed throughout the planet and what factors have contributed to this distribution?