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These were flightless seabirds that could dive in a fashion similar to grebes and loons (using its feet to move underwater), [12] but had beaks filled with sharp teeth. [13] Other Cretaceous seabirds included the gull-like Ichthyornithes. [14]
They were the dominant seabirds of most oceans throughout most of the Cenozoic, and modern humans apparently missed encountering them only by a tiny measure of evolutionary time: the last known pelagornithids were contemporaries of Homo habilis and the beginning of the history of technology.
Some prehistoric penguin species were enormous: as tall or heavy as an adult human. [8] There was a great diversity of species in subantarctic regions, and at least one giant species in a region around 2,000 km south of the equator 35 mya , during the Late Eocene , a climate decidedly warmer than today.
The Pacific gull is a large white-headed gull with a distinctively heavy bill.. Gulls range in size from the little gull, at 120 grams (4 + 1 ⁄ 4 ounces) and 29 centimetres (11 + 1 ⁄ 2 inches), to the great black-backed gull, at 1.75 kg (3 lb 14 oz) and 76 cm (30 in).
The razorbill (Alca torda) is a North Atlantic colonial seabird and the only extant member of the genus Alca of the family Alcidae, the auks. It is the closest living relative of the extinct great auk (Pinguinus impennis). [4] Historically, it has also been known as "auk", [5] "razor-billed auk" [6] and "lesser auk". [7]
Procellariiformes / p r ɒ s ɛ ˈ l ɛər i. ɪ f ɔːr m iː z / is an order of seabirds that comprises four families: the albatrosses, the petrels and shearwaters, and two families of storm petrels.
Laridae is a family of seabirds in the order Charadriiformes that includes the gulls, terns (including white terns), noddies, and skimmers. It includes around 100 species arranged into 22 genera . They are an adaptable group of mostly aerial birds found worldwide.
The specific name punctatus is Latin for "spotted", [40] and guntheri refers to German-born British herpetologist Albert Günther. [41] A 2009 paper re-examined the genetic bases used to distinguish the two supposed species of tuatara, and concluded they represent only geographic variants, and only one species should be recognized. [ 12 ]