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Echidna's Unique Reproductive Traits
- Echidnas have four-headed penises but use only two heads at a time, switching sides.
- Their sperm cooperate by forming spheres to swim faster, a unique reproductive adaptation.
Echidna Love Trains and Battles
- Male echidnas follow a female in a "love train" that can last up to a month, forming a conga line.
- When ready, they fight by pushing each other out of a trench to win mating rights.
Oldest Woman Identity Mystery
- A 47-year-old man paid a 90-year-old woman monthly for her apartment after she passed, but she lived to 122.
- There is a theory her daughter assumed her identity to avoid inheritance tax, though evidence is inconclusive.