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The Four-Headed Wonder
Male echidnas have a four-headed penis, but only use two heads at a time, alternating sides with each mating.
Echidna
Tachyglossidae
These egg-laying mammals (monotremes) are one of only five surviving species of mammals that lay eggs.
Vital Stats
🏷️ TypeMonotreme (egg-laying mammal)
🌍 Found InAustralia, Tasmania, and New Guinea — forests, scrubland, deserts
📏 Size35-53cm, 2-7kg
⏳ Lifespan15-50 years
🔞 Sexual Maturity5-12 years
💕 Mating SystemPromiscuous (multiple males form 'trains' following one female)
📅 Mating SeasonJune - September (Australian winter)
🤰 Gestation~23 days, then egg incubates in pouch for 10 days
👶 Offspring1 egg (called a puggle when hatched)
🍆 Penis Size7 cm
⏱️ Sex Duration30 minutes
🔬 Notable AnatomyMales have a four-headed penis — only two heads are used at a time
⚖️ Sexual DimorphismMales slightly larger with spur on hind leg