Risultati di ricerca
1 giorno fa · Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), 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.
6 giorni fa · John C. Mittermeier, direttore della ricerca di uccelli perduti presso l’American Bird Conservancy, che ha creato il set di dati insieme a BirdLife International e Re:wild, ha spiegato che si ...
4 giorni fa · Bird, any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more related to reptiles than mammals. Learn more about birds in this article.
5 giorni fa · You will learn about the best bird feeders, the best bird seed to attract more birds and a greater variety of birds and other tips on how to attract birds. Content for three very popular groups of birds is also included – Purple Martins, Hummingbirds and Bluebirds.
6 giorni fa · Bird - Anatomy, Flight, Migration: The structures associated with flight distinguish birds from other animals. Feathers are made of keratin; contour feathers are shed and replaced (molted) at least once a year. Color is caused by pigments and structure.
1 giorno fa · The house sparrow is a compact bird with a full chest and a large, rounded head. Its bill is stout and conical with a culmen length of 1.1–1.5 cm (0.43–0.59 in), strongly built as an adaptation for eating seeds. Its tail is short, at 5.2–6.5 cm (2.0–2.6 in) long.
4 giorni fa · 5,700 species in 74 families (depending on the authority), worldwide; complex assemblage containing more than half of all known bird species; bill, plumage, and habits highly varied; length 7.5–125 cm (3–49 inches).
