I believe it is Quantity.
Hi there... what do you exactly need help with? You’ve provided the example, however you did not say what help is needed.
The last event was each bird took a feather away from the tortoise.
The class Aves (/eviz/) of warm-blooded vertebrates includes birds, which are distinguished by their feathers, toothless beaked jaws, hard-shelled eggs, high metabolic rates, four chambered hearts, and robust yet light skeletons. The 2.8 m (9 ft 2 in) ostrich is the largest bird, while the 5.5 cm (2.2 in) bee hummingbird is the smallest. Over half of the approximately ten thousand surviving species are passerine, or "perching," birds. Only the extinct moa and elephant bird species are known to lack wings, albeit the development of wings varies between species.
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