Birds are a group of warm-blooded vertebrates, 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 5.5cm bee hummingbird to the 2.8m 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.

American Flamingo

American Flamingo
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Red-Footed Booby

Red-Footed Booby
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Collared Lory

Collared Lory
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The 2021 American Flamingo Cupro Nickel Coin
The 2021 American Flamingo Cupro Nickel CoinFrom:  £11.21

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The 2021 American Flamingo Pink and Light Green Bi-Colour Titanium Coin
The 2021 American Flamingo Pink and Light Green Bi-Colour Titanium Coin£52.50   £31.50

Limited Edition: 7,500

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The 2019 Red-Footed Booby Cupro Nickel Coin
The 2019 Red-Footed Booby Cupro Nickel CoinFrom:  £11.21

Limited Edition: 10,000

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The 2017 Collared Lory Green Titanium Coin
The 2017 Collared Lory Green Titanium Coin£47.50   £35.63

Limited Edition: 7,500

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