Well in French « retard » means “late,” same with the original etymology of the word, so I’d assume it may mean the moth is.. late in some way??? Or perhaps those who named the moth are just being mean 
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Maybe it emerges from its pupa in late spring, or just later than other daggers…
Edit: according to a redditer, it’s named that way because it has a smaller wingspan and lives in the same region as the larger American daggers. This has apparently looked “stunted”, and so the retarded dagger was named.
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Bufflehead!
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I’m calling people jellyfish cause they lack a brain
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And a spine too.
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@Mercedes-Fletcher, is this topic open to plants, protezoans, fungi, etc. or strictly animals?
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“Supine invertebrate protoplasmic jellies” - Boris Johnson
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Pigbutt worm (Chaetopterus pugaporcinus )
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