| | Science Fair Projects - Seabird |
 | | While Hesperornis is not thought to have left descendants, the earliest extant seabirds also occurred in the Cretaceous, with a species called Tytthostonyx glauconiticus, which has been placed in the Procellariiformes. |
 | | In the Paleogene the seas were dominated by early Procellariidae, giant penguins and two extinct families, the Pelagornithidae and the Plotopteridae (a group of large seabirds that looked like the penguins). |
 | | Modern genera began their wide radiation in the Miocene although the genus Puffinus (which includes today's Manx Shearwater and Sooty Shearwater) dates back to the Oligocene. |
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