how did the fourth species evolved?
They are first known to occur in the Cretaceous period, the earliest being the Hesperornithiformes
Seabird
They are first known to occur in the Cretaceous period, the earliest being the Hesperornithiformes, like "Hesperornis regalis", a flightless loon-like seabird that could dive in a fashion similar to grebes and loons (using its feet to move underwater) but had a beak filled with sharp teeth. Flying Cretaceous seabirds do not exceed wingspans of two meters; any sizes were taken by piscivorous pterosaurs.

where does the name killer whale come from UNANSWERABLE how long can these whales live? Wild females average 50 to 80 years and wild males  around 29 years on average, with a maximum of about 60 years does it have other names? Yes, "orca" how intelligent are they? Measuring "intelligence" is difficult in them because environment and behavioural strategies are very different from those of humans do they have any specific calling sound? They produce three categories of sounds: clicks, whistles, and pulsed calls is it an endangered species? Yes how is the culture of the indigenous related to them? The indigenous peoples of the Pacific Northwest Coast feature killer whales throughout their art, history, spirituality and religion which nations fall under the region of the above mentioned coast? British Columbia, Washington state, parts of Alaska, Oregon, and Northern California does the indigenous people of the coast have any certain music? Yes, the music varies in function and expression. what can you tell about their genetics? Haplogroup Q1a3a is a Y chromosome haplogroup generally associated with them what are some of the threats faced by the species mentioned earlier? Depletion of prey species, pollution, large-scale oil spills, and habitat disturbance caused by noise and conflicts with boats what kind of relation it has with humans? They have helped humans hunting other whales why do humans hold them captive? Its intelligence, trainability, striking appearance, playfulness in captivity and sheer size have made it a popular exhibit at aquaria and aquatic theme parks what does it feed on? Fish, cephalopods, mammals, seabirds, and sea turtles
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Seabird [SEP] Evolution and fossil record
In the Paleogene both pterosaurs and marine reptiles became extinct, allowing seabirds to expand ecologically. These post-extinction 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) might date back to the Oligocene. The highest diversity of seabirds apparently existed during the Late Miocene and the Pliocene. At the end of the latter, the oceanic food web had undergone a period of upheaval due to extinction of considerable numbers of marine species; subsequently, the spread of marine mammals seems to have prevented seabirds from reaching their erstwhile diversity.