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- Helicopter (20080 bytes)
1: ... The first stable, fully-controllable helicopter placed in production was invented by [[Igor Sikorsky...
5: ...tage is maneuverability: helicopters can hover in place, reverse, and above all [[take off]] and [[lan...
7: ==Applications==
15: ... not until after the invention of the powered aeroplane in the [[20th century]] that actual models wer...
19: ...emselves are moved. The helicopter's rotor can simply be regarded as rotating wings. - Budgerigar (5000 bytes)
2: {{Taxobox_image | image = [[image:budgie.two.750pix.jpg|250px|Domesticated Budgerigars]] |...
3: {{Taxobox_begin_placement | color = pink}}
11: {{Taxobox_end_placement}}
14: ...''Budgerigar''' (''Melopsittacus undulatus'') or "Budgie", is a small [[parrot]] (they are often called [[...
16: ...s which promote the growth of the grass and other plant seeds that comprise their diet. The nest is in... - Cockatiels (4283 bytes)
3: {{Taxobox_begin_placement | color = pink}}
12: {{Taxobox_end_placement}}
18: ...biology)|family]] [[Cacatuidae]]; currently it is placed as the only species in the [[genus]] ''Nymphi...
20: ...ds and (sometimes) feeding periods. The [[Feather|plumage]] is generally mid-grey, lighter underneath,...
26: ...ied by smaller but more confident birds such as [[budgie]]s.
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