Derris
n. 鱼藤, 鱼藤酮(一种杀虫剂)\\n[医] 鱼藤属
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This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
这是因为人类到达这里之前，这些鸟没有天敌，因此，它们不需要发育飞行的翅膀。