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All-Female Fish Army
Amazon mollies are an all-female species that 'steals' sperm from males of other species to trigger reproduction — but doesn't use any of the male's DNA.
Amazon Molly
Poecilia formosa
This all-female fish species has one of the strangest reproductive strategies in nature.
Vital Stats
🏷️ TypeFish (live-bearer)
🌍 Found InNortheastern Mexico and southern Texas — freshwater and brackish streams
📏 Size5-8cm
⏳ Lifespan1-2 years
💕 Mating SystemGynogenesis — sperm required to trigger reproduction but not used genetically
📅 Mating SeasonYear-round
👶 Offspring30-100 live young per brood (all female clones)
🍆 Penis SizeN/A
⏱️ Sex Duration5 seconds
🔬 Notable AnatomyAll-female species; mate with males of related species but don't use their DNA — pure maternal clones
⚖️ Sexual DimorphismN/A — entirely female (originated ~100,000 years ago from hybrid event)