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Why not make them parasites - on their parent? Take, for example, the parasitoid wasp. Female adult wasps lay eggs in or on another creature - the host. The young them develop inside the host, fee...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:41Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/6615 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/