These similarities, however, as the more recently determined fact that the osteons of their bones at least in " Hesperornis " were arranged in a pattern similar to that in Neognathae, are today considered to be due to convergent evolution.
32.
In 1993, the first " Hesperornis " remains from outside of North America were recognized as a new species by Nessov and Yarkov . They named " Hesperornis rossicus " for a fragmentary skeleton from the early Campanian of Russia near Volgograd.
33.
In 1993, the first " Hesperornis " remains from outside of North America were recognized as a new species by Nessov and Yarkov . They named " Hesperornis rossicus " for a fragmentary skeleton from the early Campanian of Russia near Volgograd.
34.
"Hesperornis " was primarily marine, and lived in the waters of such contemporary shallow shelf seas as the Western Interior Seaway, the Turgai Strait, and the North Sea, which then were subtropical to tropical waters, much warmer than today.
35.
Two " Hesperornis " investigate, but Helen Cutter shoos them off by throwing small stones, and says that they " " tend to be more dumb than violent, only attacking when they're in a panic or disturbed . ""
36.
However, some of the youngest known specimens of " Hesperornis " have been found in inland freshwater deposits of the Foremost Formation, suggesting that some species of " Hesperornis " may have eventually moved, at least partially, away from a primarily marine habitat.
37.
However, some of the youngest known specimens of " Hesperornis " have been found in inland freshwater deposits of the Foremost Formation, suggesting that some species of " Hesperornis " may have eventually moved, at least partially, away from a primarily marine habitat.
38.
Like modern birds, " Confuciusornis " had a toothless beak, but close relatives of modern birds such as " Hesperornis " and " Ichthyornis " were toothed, indicating that the loss of teeth occurred convergently in " Confuciusornis " and living birds.
39.
In terms of limb length, shape of the hip bones, and position of the hip socket, " Hesperornis " is particularly similar to the common loon ( " Gavia immer " ), probably exhibiting a very similar manner of locomotion on land and in water.
40.
You " et al . " ( 2006 ) concluded that the anatomical characteristics of " Gansus " were similar to foot-propelled diving birds, such as " Hesperornis " ( from the Cretaceous ) and the loons ( Gaviidae ) and grebes ( Podicipedidae ).
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