Flight only evolved once in the insect kingdom? I can't be sure of that. Some insects have this oscillator muscle, oscillating muscle. That might suggest two different independent evolutions of flight. And i suppose i should give you an opportunity to talk about some of the quirkier ways that animals have developed flight. There are things that just float, right? And certainly there are things that glide that you 've already mentioned, yes. E, the book, of course, is also about a human flight. e, humans also use balloons, ad use lighter than air principle, balloons and airships, dirigibles.

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