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  2. Bird - Wikipedia

    • 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) common ostr… See more

    Evolution and classification

    The first classification of birds was developed by Francis Willughby and John Ray in their 1676 volume Ornithologiae.
    Aves … See more

    Distribution

    Birds live and breed in most terrestrial habitats and on all seven continents, reaching their southern extreme in the snow petrel's breeding colonies up to 440 kilometres (270 mi) inland in Antarctica. The highest bird … See more

    Image result for Bird. Size: 307 x 200. Source: www.goodfreephotos.com
    Anatomy and physiology

    Compared with other vertebrates, birds have a body plan that shows many unusual adaptations, mostly to facilitate flight.
    The skeleton consists of very lightweight bones. They have large air-filled cavities (called pne… See more

    Behaviour

    Most birds are diurnal, but some birds, such as many species of owls and nightjars, are nocturnal or crepuscular (active during twilight hours), and many coastal waders feed when the tides are appropriate, by day or night. … See more

    Ecology

    Birds occupy a wide range of ecological positions. While some birds are generalists, others are highly specialised in their habitat or food requirements. Even within a single habitat, such as a forest, the niches occupied b… See more

    Relationship with humans

    Since birds are highly visible and common animals, humans have had a relationship with them since the dawn of man. Sometimes, these relationships are mutualistic, like the cooperative honey-gathering a… See more

    Threats and conservation

    Human activities have caused population decreases or extinction in many bird species. Over a hundred bird species have gone extinct in historical times, although the most dramatic human-caused avian extinctions… See more

     
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  2. Guide to North American Birds | Audubon

    WEBExplore more than 800 bird species in North America, with photos, sounds, and information on their habitats and conservation. Learn how climate change is affecting their survival and how to identify them by sight and …

  3. Bird Pictures & Facts - National Geographic

    WEBExplore the diversity and adaptability of birds with stunning photos and stories. Learn about their anatomy, evolution, behavior, and conservation.

  4. Bird | Description, Species, Feathers, & Facts | Britannica

  5. Online bird guide, bird ID help, life history, bird sounds from …

  6. Birds of the World - Cornell Lab of Ornithology

    WEBBirds of the World is a powerful resource that brings deep, scholarly content from four celebrated works of ornithology into a single platform where biologists and birders can find comprehensive life history …

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  8. eBird - Discover a new world of birding...

    WEBeBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.

  9. 25 Backyard Bird Species in Missouri (Pictures)

    WEBMay 24, 2024 · In this article, we’re going to take a look at 25 of the most common backyard birds in Missouri and learn a little about each species. After this list of Missouri birds there’s tips for how to attract some of …

  10. National Audubon Society

  11. Missouri Birds: Pictures And Bird Identification Tips

    WEBAll kinds of Missouri birds covered, such as common back yard birds, wer birds and migratory songbirds. Many pictures to help with bird identification.

  12. Identifying Birds - Missouri Department of Conservation

    WEBEvery bird species exhibits its own identification clues, including size and shape, color and field marks, songs and calls, behavior traits, and habitats where they are most likely to be found. Some species can be identified …

  13. Search, All About Birds, Cornell Lab of Ornithology

  14. All About Birds | Birds, Cornell Lab of Ornithology

  15. 32 Backyard Birds to Know | Missouri - What Birds Are In My …

  16. Birds Facts, Pictures & Information: The Ultimate Guide To Birds …

  17. Birds - National Geographic Kids

  18. Discover Birds | Audubon

  19. Birds: Different Types, Definition, Photos, and More - A-Z Animals

  20. Bird Guide Browse by Taxonomy - All About Birds

  21. All About Birds for Children: Animal Learning for Kids - YouTube

  22. Identifying Birds | Audubon

  23. Bird Id - Easy Bird Identification - Easy Bird Identifier - North ...

  24. Birds A-Z | Bird Guides - The RSPB Wildlife Charity