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Birds feature in the flag designs of 17 countries and numerous subnational entities and territories. [326] Birds are used by nations to symbolise a country's identity and heritage, with 91 countries officially recognising a national bird. Birds of prey are highly represented, though some nations have chosen other species of birds with parrots ...
Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year. It is typically from north to south or from south to ...
An audio recording of a house sparrow. The house sparrow (Passer domesticus) is a bird of the sparrow family Passeridae, found in most parts of the world. It is a small bird that has a typical length of 16 cm (6.3 in) and a mass of 24–39.5 g (0.85–1.39 oz).
The jackrabbit follows a 10-year cycle where it peaks and crashes. In Idaho, 100% of observed nests produced at least one fledgling when the jackrabbits peaked in the late 1970s through the early 1980s and then at the low point in the mid to late 1980s, the nests produced on average only 0.2 fledglings. [ 90 ]
The evolution of birds began in the Jurassic Period, with the earliest birds derived from a clade of theropod dinosaurs named Paraves. [1] Birds are categorized as a biological class, Aves. For more than a century, the small theropod dinosaur Archaeopteryx lithographica from the Late Jurassic period was considered to have been the earliest bird.
Use and duration of torpor vary among hummingbird species and are affected by whether a dominant bird defends territory, with nonterritorial subordinate birds having longer periods of torpor. [129] A hummingbird with a higher fat percentage will be less likely to enter a state of torpor compared to one with less fat, as a bird can use the ...
Early birds may catch the worm - but it's the early volunteers who catch the birds. And the ones that get caught in the 18-metre long, fine-mist nets strung high across a reed bed at Killycolpy ...
Inhalation–exhalation cycle in birds. Due to the high metabolic rate required for flight, birds have a high oxygen demand. Their highly effective respiratory system helps them meet that demand. Although birds have lungs, theirs are fairly rigid structures that do not expand and contract as they do in mammals, reptiles and many amphibians.