What is special about these four species of birds
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Explanation:
The Auk: Ornithological Advances aims to advance fundamental scientific knowledge by increasing the basic knowledge of bird species, both living and extinct, and the knowledge of broad biological concepts through studies of bird species. The Auk has been published continuously since 1884 and was recently recognized as one of the 100 most influential journals of biology and medicine over the past 100 years. The journal holds an Impact Factor of 2.442, making it the third-ranked journal in the field of ornithology. The Auk holds the highest 5 Year Impact Factor of all ornithology journals, 2.438.
Answer:
Birds are a group of warm-blooded vertebrates constituting the class Aves characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.
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